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Simplifying x + (x + 40) + (x + 40 + 40) = 180 Reorder the terms: x + (40 + x) + (x + 40 + 40) = 180 Remove parenthesis around (40 + x) x + 40 + x + (x + 40 + 40) = 180 Reorder the terms: x + 40 + x + (40 + 40 + x) = 180 Combine like terms: 40 + 40 = 80 x + 40 + x + (80 + x) = 180 Remove parenthesis around (80 + x) x + 40 + x + 80 + x = 180 Reorder the terms: 40 + 80 + x + x + x = 180 Combine like terms: 40 + 80 = 120 120 + x + x + x = 180 Combine like terms: x + x = 2x 120 + 2x + x = 180 Combine like terms: 2x + x = 3x 120 + 3x = 180 Solving 120 + 3x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-120' to each side of the equation. 120 + -120 + 3x = 180 + -120 Combine like terms: 120 + -120 = 0 0 + 3x = 180 + -120 3x = 180 + -120 Combine like terms: 180 + -120 = 60 3x = 60 Divide each side by '3'. x = 20 Simplifying x = 20
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