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Simplifying 129 = -2x + -5(2x + -3) Reorder the terms: 129 = -2x + -5(-3 + 2x) 129 = -2x + (-3 * -5 + 2x * -5) 129 = -2x + (15 + -10x) Reorder the terms: 129 = 15 + -2x + -10x Combine like terms: -2x + -10x = -12x 129 = 15 + -12x Solving 129 = 15 + -12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12x' to each side of the equation. 129 + 12x = 15 + -12x + 12x Combine like terms: -12x + 12x = 0 129 + 12x = 15 + 0 129 + 12x = 15 Add '-129' to each side of the equation. 129 + -129 + 12x = 15 + -129 Combine like terms: 129 + -129 = 0 0 + 12x = 15 + -129 12x = 15 + -129 Combine like terms: 15 + -129 = -114 12x = -114 Divide each side by '12'. x = -9.5 Simplifying x = -9.5
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