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Simplifying 15x + 12(10 + -1x) = 141 15x + (10 * 12 + -1x * 12) = 141 15x + (120 + -12x) = 141 Reorder the terms: 120 + 15x + -12x = 141 Combine like terms: 15x + -12x = 3x 120 + 3x = 141 Solving 120 + 3x = 141 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-120' to each side of the equation. 120 + -120 + 3x = 141 + -120 Combine like terms: 120 + -120 = 0 0 + 3x = 141 + -120 3x = 141 + -120 Combine like terms: 141 + -120 = 21 3x = 21 Divide each side by '3'. x = 7 Simplifying x = 7
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