Equation Unknowns 19 11 37 Unknowns 25 7 8 Unknowns 4 3 9 3 Unknowns 2 8

Unknowns -19=11 x-19=11 x=19+11 x=30 Check: 30-19=11

37-unknown=25 37-x=25 37-25=x x=12 Check: 37-12=25

Unknowns = x= check:

Unknowns = x= check:

According to a+b+c=120, a=b+c, b=2c. Find the values of a, b, and c.

Solution: According to a=b+c, b=2c.

a=b+c=2c+c=3c

So a+b+c=3c+2c+c=6c=120c=20, so a=3c=3*20=60

b=2c=2*20=40

x-19 equals 11 x equals 30 37-x equals 25 x equals 12 equals x equals.

Equal to x equals.

Unknown number of grandchildren 10% = unknown number - 3297 unknown number - unknown number of socks 10% = 3297

Unknown = 3297

Unknown = 3297

, move the item, get , then x= x=

21 x=, change to product, get 21=, x= x=78-x=31, shift the term, get x=78-31 x=47 [[Unclear, ask again; Satisfied, please adopt! Good luck opening !!

, add x on both sides of the equal sign to get, then x=

x (x+60)=495

4 - x÷ ÷x=

x÷x÷x=50 x= x=

x=1.I don't know if you've learned negative numbers, but that's probably it.

Please put a few more spaces between questions.

1) x = 50 or x + 60 = 495

x+60=110

x=50（2）

4-2x=2x=x=

x=x=Pay attention to the order of addition, subtraction, multiplication, and division.

Count yourself in, this kind of topic is very simple.

If x is unknown, then x 21=7....5 is the equation.

Mistake. The equation is an equation with unknowns, x 21 = 7....5 is not an equation.

x÷21=7+5

It's an equation, your formula isn't an equation.

If x is an unknown number, then x 21=7....5 is the equation. Right.

According to the definition of an equation: an equation containing unknowns is called an equation.

Solution: (x-5) 21=7

x-5=7x21

x-5=147

x=147+5

x=152。