Step 1: Simplify by collecting like terms. Which terms can be collected?
-7x and 12 12 and -2 -7x and -2x

Step 2: Add to both sides of the equation: 9x 12 13x

Step 3: Subtract from both sides of the equation:
-2x 13x 23

Step 4: Divide both sides of the equation by:
1/22 -22 22