Question

The solution of 12 + 2x – x = 9x + 28

Answer 1

9x-28=x+12

We move all terms to the left:

9x-28-(x+12)=0

We get rid of parentheses

9x-x-12-28=0

We add all the numbers together, and all the variables

8x-40=0

We move all terms containing x to the left, all other terms to the right

8x=40

x=40/8

x=5

Answer 2

x = -2

Explanation:

Isolate the variable by dividing each side by factors that don't contain the variable.