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Simplifying 2(90 + -1x) = (180 + -1x) + -18 (90 * 2 + -1x * 2) = (180 + -1x) + -18 (180 + -2x) = (180 + -1x) + -18 Remove parenthesis around (180 + -1x) 180 + -2x = 180 + -1x + -18 Reorder the terms: 180 + -2x = 180 + -18 + -1x Combine like terms: 180 + -18 = 162 180 + -2x = 162 + -1x Solving 180 + -2x = 162 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 180 + -2x + x = 162 + -1x + x Combine like terms: -2x + x = -1x 180 + -1x = 162 + -1x + x Combine like terms: -1x + x = 0 180 + -1x = 162 + 0 180 + -1x = 162 Add '-180' to each side of the equation. 180 + -180 + -1x = 162 + -180 Combine like terms: 180 + -180 = 0 0 + -1x = 162 + -180 -1x = 162 + -180 Combine like terms: 162 + -180 = -18 -1x = -18 Divide each side by '-1'. x = 18 Simplifying x = 18
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