Answer :
[tex]7+3x=5x+13\\ 7+3x-3x=5x+13-3x\\ 7=2x+13\\ 7-13=2x+13-13\\ -6=2x\\ \frac{-6}{2} =\frac{2x}{2}\\ -3=x[/tex]
7 + 3x = 13 + 5x
Add 5x to both side
7 + 3x + -5x = 13 + 5x + -5x
This two is 0
5x + -5x = 0
Add seven on both sides
7 + -7 + -2x = 13 + -7
3 + -7 = 6
x = -3
Add 5x to both side
7 + 3x + -5x = 13 + 5x + -5x
This two is 0
5x + -5x = 0
Add seven on both sides
7 + -7 + -2x = 13 + -7
3 + -7 = 6
x = -3
