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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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