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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 = -144 -12x = -144 Divide each side by '-12'. x = 12 Simplifying x = 12
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