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Simplifying (x + 40) + -1(20 + -1x) = 180 Reorder the terms: (40 + x) + -1(20 + -1x) = 180 Remove parenthesis around (40 + x) 40 + x + -1(20 + -1x) = 180 40 + x + (20 * -1 + -1x * -1) = 180 40 + x + (-20 + 1x) = 180 Reorder the terms: 40 + -20 + x + 1x = 180 Combine like terms: 40 + -20 = 20 20 + x + 1x = 180 Combine like terms: x + 1x = 2x 20 + 2x = 180 Solving 20 + 2x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 2x = 180 + -20 Combine like terms: 20 + -20 = 0 0 + 2x = 180 + -20 2x = 180 + -20 Combine like terms: 180 + -20 = 160 2x = 160 Divide each side by '2'. x = 80 Simplifying x = 80
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