Question

Justify each step used to simplify the expression.3x+2y-2x+2=3x-2x+2y+2

Answer 1

3x+2y-2x+2=3x-2x+2y+2
First collect the like terms 
3x-2x-3x+2x+2y-2y=2-2
x-3x+2x=0
-2x+2x=0
Your answer is 0