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Simplifying 120 = -5(-3 + -3x) 120 = (-3 * -5 + -3x * -5) 120 = (15 + 15x) Solving 120 = 15 + 15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15x' to each side of the equation. 120 + -15x = 15 + 15x + -15x Combine like terms: 15x + -15x = 0 120 + -15x = 15 + 0 120 + -15x = 15 Add '-120' to each side of the equation. 120 + -120 + -15x = 15 + -120 Combine like terms: 120 + -120 = 0 0 + -15x = 15 + -120 -15x = 15 + -120 Combine like terms: 15 + -120 = -105 -15x = -105 Divide each side by '-15'. x = 7 Simplifying x = 7
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