How do you solve the equation 6 7 3 x 21?

In mathematics, solving equations.

is the process of finding the values of all the unknowns in an equation.

The properties of equations are mainly applied to solving equations, and common methods include estimation and merging similar terms.

Shifts, formulas, function images.

law, etc. Introduction.

1.An equation containing unknowns is called an equation, and it can also be said that an equation containing unknowns is an equation.

2.The value of the unknown that makes the equation true, called the solution of the equation, or the root of the equation.

3.Solving an equation is the process of finding the values of all the unknowns in the equation.

4.An equation must be an equation, and an equation does not have to be an equation. An equation without unknowns is not an equation.

5.Validation: After the equation is generally solved, it needs to be verified. Verification is to substitute the value of the solved unknown into the original equation to see if both sides of the equation are equal. If it is equal, then the value obtained is the solution of the equation.

6.Precautions: Write the word "solution", align the equal sign, and test.

7.The equation relies on the relation of the parts of the equation, and the relation of the parts of addition, subtraction, multiplication and division (addition + addition = sum, sum - one of the additions = another addition, difference + subtraction = subtraction, subtraction - subtraction = difference, subtraction - difference = subtraction, factor factor = product, product of one factor = another factor, dividend.

divisor = quotient, dividend quotient = divisor, quotient divisor = dividend).

Solution process. Method.

Estimation method: An introductory method when you are just learning to solve equations. The solution of the equation is directly estimated and then verified by substitute for the original equation.

Apply the properties of the equation to solve the equation.

Merge Homogeneous Terms: Transforms the equation into a monomial.

Move Items: Moves items with unknowns to the left and constant items to the right.

Solution process. Method. Estimation method: An introductory method when you are just learning to solve equations. The solution of the equation is directly estimated and then verified by substitute for the original equation.

Apply the properties of the equation to solve the equation.

Merge Homogeneous Terms: Transforms the equation into a monomial.

Move Items: Moves items with unknowns to the left and constant items to the right.

6.Formula method: There are some equations that have been studied in the general form of the solution, which become fixed formulas, and can be directly used by formulas. Solvable multivariate higher-order equations generally have formulas to follow.

7.Function image method: The solution of an equation is used to solve the geometric meaning of the intersection of two or more related function images.

Equations are positive thinking.

Steps. There is a denominator to go to the denominator first.

If there are parentheses, remove the parentheses.

If you need to move an item, you will do it.

Merge items of the same kind.

The coefficient is reduced to 1 to obtain the value of the unknown.

Write "solution" at the beginning

So, the equation.

The solution process of 6*7-3x=21 is as follows:

6*7-3x=21

Solution: 42-3x=21

3x=42-21

3x=21x=21/3x=7

3x 21 Solution: Divide both sides of the 3x 21 equation by 3 at the same time to obtain: x 7 Analysis:

It can be seen from the question that the coefficient of x is 3, because here we require the value of x, so we have to remove its coefficient of 3, so how to remove it? 3x is 3 times x, then we need to remove 3, so we divide by 3 on the right side of the equation, according to the nature of the equation (both sides of the equation are multiplied or divided by the same number at the same time, the result is still an integer) the left side of the equation can be divided by 3, 3x 3=x, 21 3=7, so the result is x 7

3x=21, then divide both sides by 3, and then it is equal to x=21 73, so x is equal to 7.

Do you still need to ask someone else for such a simple equation? Haven't you learned the calculation of equations well, this is only one part, that is, go directly to the coefficients! In other words, x is equal to 21 3! Finally, x equals seven.

In this equation, we want to find the unknown number x

You can divide both sides by three at the same time, and the equation still holds.

The equation is solved as follows.

3 x=21

x=21÷3

x=7 check: 3 7=21

This is the detailed process of solving this equation.

For such an equation, remember a rule: move the number with x to the left of the equal sign, and move the number without x to the right of the equal sign, and the new equation is:

3x=21-2×3

3x=21-6

x=15/3

x=5 This is how and how this type of equation is solved.

3x=21+6

3x=27x=9

The value of an unknown that equalizes the left and right sides of the equation is called the solution of the equation. The process of finding the full solution of the equation or judging that the equation has no solution is called solving the equation. An equation that must contain an equation of unknowns is called an equation. The equation must be an equation if it is not a state, and the equation must be an equation.

Solve the equation 3x+6=21.

Yes, 3x=21-6.

3x=15.

Finally, x=15 equals 5.

3x+2×3=21

Solution: 3x+6=21 - first calculate 2 3 to get the bridge to do slip 63x=21-6 - one addition = sum - another addition.

3x=15x=15 3 The number of traces of one cause = the product of the other number of factors. x=5

3x+4x=66 Solution: Merge similar terms to get: 7x=66 Divide both sides of the equation by 7 at the same time to get:

x=66/7.Test Points: General Demolition of Unary Equations 1.

If there is a denominator, you have to close the denominator first. 2。There are parentheses, and then the parentheses are removed.

3。Move the car to the virtual item. 4。

Merge the same kind.

Summary. Answer, x=, calculation process, solution: (3-1) x=21, 2x=21, 2x=21, 2x=, the solution of the equation is x=, and the equation is solved using the properties of the equation.

3x-x=21 how to solve the equation.

Answer, x=, calculation process, solution: (3-1) x=21, 2x=21, 2x 2=21 2, x=, the solution of the equation is the clever argument x=, the property of the rotten equation is used to solve the equation.

Answer, x=, calculation process, solution: (3-1) x=21, 2x=21, 2x 2=21 2, x=, the solution of the equation is the clever argument x=, the property of the rotten equation is used to solve the equation.

3x+6=21

3x= 21-6

3x= 15

x = 5 to solve the equation.

The value of an unknown that equalizes the left and right sides of the equation is called the solution of the equation. The process of finding the entire solution of an equation or determining that there is no solution to an equation is called solving an equation. An equation that must contain an equation of unknowns is called an equation. The equation must be an equation with the nucleus, and the equation must be an equation.

Because 2 3=6, both sides of the original equation are reduced by 6 at the same time to get 3x=15, and both sides of this side are divided by 3 at the same time.

x=5, so the solution of the original equation is x=5

Step 1: 2 3=6 Step 2: 1 3=30 Step 3: 2 3=600 According to the above calculation results, the sum of the game is 636 Check: 636 3=212

Summary. 3x=3×7

3x÷3=21÷3

x=73x=3 7=21 The process of solving the equation.

Hello, it is a pleasure to answer your questions, and the specific answers are as follows:

3x=213x÷3=21÷3x=7

3x=3×73x÷3=21÷3x=7

I hope it can help you, if it helps you, please give a like, thank you. (・