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Simplifying 2x + (x + 9) = 180 Reorder the terms: 2x + (9 + x) = 180 Remove parenthesis around (9 + x) 2x + 9 + x = 180 Reorder the terms: 9 + 2x + x = 180 Combine like terms: 2x + x = 3x 9 + 3x = 180 Solving 9 + 3x = 180 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 + 3x = 180 + -9 Combine like terms: 9 + -9 = 0 0 + 3x = 180 + -9 3x = 180 + -9 Combine like terms: 180 + -9 = 171 3x = 171 Divide each side by '3'. x = 57 Simplifying x = 57
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