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Simplifying (2x + -15) = 129 Reorder the terms: (-15 + 2x) = 129 Remove parenthesis around (-15 + 2x) -15 + 2x = 129 Solving -15 + 2x = 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 + 2x = 129 + 15 Combine like terms: -15 + 15 = 0 0 + 2x = 129 + 15 2x = 129 + 15 Combine like terms: 129 + 15 = 144 2x = 144 Divide each side by '2'. x = 72 Simplifying x = 72
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