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Simplifying (180 + -1x) + -42 = x Remove parenthesis around (180 + -1x) 180 + -1x + -42 = x Reorder the terms: 180 + -42 + -1x = x Combine like terms: 180 + -42 = 138 138 + -1x = x Solving 138 + -1x = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 138 + -1x + -1x = x + -1x Combine like terms: -1x + -1x = -2x 138 + -2x = x + -1x Combine like terms: x + -1x = 0 138 + -2x = 0 Add '-138' to each side of the equation. 138 + -138 + -2x = 0 + -138 Combine like terms: 138 + -138 = 0 0 + -2x = 0 + -138 -2x = 0 + -138 Combine like terms: 0 + -138 = -138 -2x = -138 Divide each side by '-2'. x = 69 Simplifying x = 69
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