What is 3/4x-7=8+-6x

what is means?

3/4x-7=8+-6x

Add 7 to both sides.
3/4x=15-6x
Add 6x to both sides.
6 3/4x=15
Divide both sides by 6 3/4.
15/ 6 3/4=?

3x_12

THANKS JEN!