Multiply both sides by 3. You will get 2x = 72 + 18x. Move 18x from right side to the left side changing the sign 2x - 18x = 72. Combine like terms in the left side -16x = 72. Divide both sides by -16 x = 72/(-16) = - 72/16 = -9/2. ANSWER. x = -9/2.