Solve the equation urgently, who is quick to add points! Solve the equation and add it in points! Hu

What is the equivalence relationship in my junior high school.

x + x = 420 out of 6

6x+x=2520

7x=2520

x=2520÷7

x=360 If it helps you, please remember to adopt, o( o thank you.

x+x/6=420

Multiply 6 on both sides of the equation to remove the denominator to get :

6x+x=2520

Merge: 7x=2520

Coefficients of 1 yield:

x=360

x+x=420 x by 6 sides of the equation multiplied by 6

6x+x=2520

7x=2520

x=2520÷7

x=360

2.The set price is x yuan, x = 300 A: The price of the product is 300 yuan.

3.Let the distance between the two places be x kilometers.

x x=72A: Omitted.

x=1007.Set: When the speed of the river is x km.

x-2-2=22

x=268.Set a profit of $x.

a*（1=x=114a

1.Set up to rent x 45-seater buses, according to the title:

45x=60(x-1)-30

Solution: x=6

6 45 = 270 (person).

A: The number of students participating in the spring outing at the school is 270.

The speed of the car is x

Five-thirds multiplied.

x=15

x+y=70---1)

2 3x=1 Qi 2y---2).

From (2) x=1 2*3 2y=3 4y, substituted by Zheng Zaixiao (1)3 shouting contains 4y+y=70

7/4y=70

y=40x=70-40=30

2 3x=1 2y equation 2 sides multiply 6 at the same time.

4x=3yx=3 4y

With such as x+y=70, the number of potatoes is rushed.

3/4y+y=70

7/4y=70

1/4y=10

y=40x=30

Equation Yu Peibei 2 multiply 6 on both sides to get 4x=6y 4x-6y=0 in the formula, open 1 times vertical destruction 6 to get 6x+6y=420

1+2 gives 10x=420 x=42

y=28

Let's take x copies.

then 98-x=2(40+x).

98-x=80+2x

3x=18x=6Answer: Take 6 books from the upper floor to the lower floor.

Solution: Let's take x books from the top to the bottom.

98-x=2(40+x)

98-x=80+2x

3x=18x=6Answer: Take 6 books from the upper floor to the lower floor.

If you need to get x books, you need to get x books, and there are virtual lines:

98-x=40+x+18;

2x=40;

x=20;So you need to take 20 copies.

Let x be the number of books that have been obtained from the upper layer of the letter to the lower layer. Ziyu.

then there is 98-x-(40+x)=18

Solve the equation to get x=20