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Simplifying 180 + -1(90 + -3x) = x + -20 180 + (90 * -1 + -3x * -1) = x + -20 180 + (-90 + 3x) = x + -20 Combine like terms: 180 + -90 = 90 90 + 3x = x + -20 Reorder the terms: 90 + 3x = -20 + x Solving 90 + 3x = -20 + 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. 90 + 3x + -1x = -20 + x + -1x Combine like terms: 3x + -1x = 2x 90 + 2x = -20 + x + -1x Combine like terms: x + -1x = 0 90 + 2x = -20 + 0 90 + 2x = -20 Add '-90' to each side of the equation. 90 + -90 + 2x = -20 + -90 Combine like terms: 90 + -90 = 0 0 + 2x = -20 + -90 2x = -20 + -90 Combine like terms: -20 + -90 = -110 2x = -110 Divide each side by '2'. x = -55 Simplifying x = -55
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