Step 1: Combine like terms to get:

Answers
-X-12=-10x+6
5x-18=-3x-1
X-12=-10x-6
9x-12=6
-12=-11x+6
8x-18=-1
8x=19
9x=18
-18=-11x
X=2
X=0
X=11/18

The final answers are X=2, X=0, and X=11/18.