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Simplifying 129 + (3x + 9) = 180 Reorder the terms: 129 + (9 + 3x) = 180 Remove parenthesis around (9 + 3x) 129 + 9 + 3x = 180 Combine like terms: 129 + 9 = 138 138 + 3x = 180 Solving 138 + 3x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-138' to each side of the equation. 138 + -138 + 3x = 180 + -138 Combine like terms: 138 + -138 = 0 0 + 3x = 180 + -138 3x = 180 + -138 Combine like terms: 180 + -138 = 42 3x = 42 Divide each side by '3'. x = 14 Simplifying x = 14
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