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Simplifying 4(90 + -1x) + -129 = 180 + -1x (90 * 4 + -1x * 4) + -129 = 180 + -1x (360 + -4x) + -129 = 180 + -1x Reorder the terms: 360 + -129 + -4x = 180 + -1x Combine like terms: 360 + -129 = 231 231 + -4x = 180 + -1x Solving 231 + -4x = 180 + -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. 231 + -4x + x = 180 + -1x + x Combine like terms: -4x + x = -3x 231 + -3x = 180 + -1x + x Combine like terms: -1x + x = 0 231 + -3x = 180 + 0 231 + -3x = 180 Add '-231' to each side of the equation. 231 + -231 + -3x = 180 + -231 Combine like terms: 231 + -231 = 0 0 + -3x = 180 + -231 -3x = 180 + -231 Combine like terms: 180 + -231 = -51 -3x = -51 Divide each side by '-3'. x = 17 Simplifying x = 17
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