Subtract 12 from both sides of the equation:
3x + 12 = 2x
3x + 12 - 12 = 2x - 12
Simplify:
3x = 2x - 12
Subtract 2x from both sides of the equation:
3x = 2x - 12
3x-2x = 2x - 12-2x
Simplify:
combine like terms --> multiply by 1 --> combine like terms
x = -12 <-- ANSWER
