Move all terms containing x to the left, all other terms to the right. Add '-240' to each side of the equation. 240 + -240 + 12x = 372 + -240 Combine like terms: 240 + -240 = 0 0 + 12x = 372 + -240 12x = 372 + -240 Combine like terms: 372 + -240 = 132 12x = 132 Divide each side by '12'. x = 11 Simplifying x = 11