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Simplifying (x + 10) + (x + 20) + x = 180 Reorder the terms: (10 + x) + (x + 20) + x = 180 Remove parenthesis around (10 + x) 10 + x + (x + 20) + x = 180 Reorder the terms: 10 + x + (20 + x) + x = 180 Remove parenthesis around (20 + x) 10 + x + 20 + x + x = 180 Reorder the terms: 10 + 20 + x + x + x = 180 Combine like terms: 10 + 20 = 30 30 + x + x + x = 180 Combine like terms: x + x = 2x 30 + 2x + x = 180 Combine like terms: 2x + x = 3x 30 + 3x = 180 Solving 30 + 3x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + 3x = 180 + -30 Combine like terms: 30 + -30 = 0 0 + 3x = 180 + -30 3x = 180 + -30 Combine like terms: 180 + -30 = 150 3x = 150 Divide each side by '3'. x = 50 Simplifying x = 50
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