Answer :
-7x - 17 = -9x + 13
Add 9x to each side: 2x - 17 = 13
Add 17 to each side: 2x = 30
Divide each side by 2 : x = 15
Add 9x to each side: 2x - 17 = 13
Add 17 to each side: 2x = 30
Divide each side by 2 : x = 15