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Simplifying 4(3 + 5x) + -3 = 129 (3 * 4 + 5x * 4) + -3 = 129 (12 + 20x) + -3 = 129 Reorder the terms: 12 + -3 + 20x = 129 Combine like terms: 12 + -3 = 9 9 + 20x = 129 Solving 9 + 20x = 129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 20x = 129 + -9 Combine like terms: 9 + -9 = 0 0 + 20x = 129 + -9 20x = 129 + -9 Combine like terms: 129 + -9 = 120 20x = 120 Divide each side by '20'. x = 6 Simplifying x = 6
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