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Simplifying 2x + -5(-2x + -3) = -129 Reorder the terms: 2x + -5(-3 + -2x) = -129 2x + (-3 * -5 + -2x * -5) = -129 2x + (15 + 10x) = -129 Reorder the terms: 15 + 2x + 10x = -129 Combine like terms: 2x + 10x = 12x 15 + 12x = -129 Solving 15 + 12x = -129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 12x = -129 + -15 Combine like terms: 15 + -15 = 0 0 + 12x = -129 + -15 12x = -129 + -15 Combine like terms: -129 + -15 = -144 12x = -144 Divide each side by '12'. x = -12 Simplifying x = -12
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