I first subtracted 6x from both sides

6x + 7 = 8x - 13 -6x + 6x + 7 = 8x - 13 - 6x 7 = 2x - 13

I then added 13 to each side

7 = 2x - 13 13 + 7 = 2x - 13 + 13 20 = 2x

Finally I divided both sides by 2

^{20} /_{2} = ^{2x} /_{2} 10 = x

Penny