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Simplifying 180 + -1x = 2((90 + -1x) + -1x) + -15 Remove parenthesis around (90 + -1x) 180 + -1x = 2(90 + -1x + -1x) + -15 Combine like terms: -1x + -1x = -2x 180 + -1x = 2(90 + -2x) + -15 180 + -1x = (90 * 2 + -2x * 2) + -15 180 + -1x = (180 + -4x) + -15 Reorder the terms: 180 + -1x = 180 + -15 + -4x Combine like terms: 180 + -15 = 165 180 + -1x = 165 + -4x Solving 180 + -1x = 165 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. 180 + -1x + 4x = 165 + -4x + 4x Combine like terms: -1x + 4x = 3x 180 + 3x = 165 + -4x + 4x Combine like terms: -4x + 4x = 0 180 + 3x = 165 + 0 180 + 3x = 165 Add '-180' to each side of the equation. 180 + -180 + 3x = 165 + -180 Combine like terms: 180 + -180 = 0 0 + 3x = 165 + -180 3x = 165 + -180 Combine like terms: 165 + -180 = -15 3x = -15 Divide each side by '3'. x = -5 Simplifying x = -5
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