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Simplifying 140 = x + -2x + -1(x + 20) Reorder the terms: 140 = x + -2x + -1(20 + x) 140 = x + -2x + (20 * -1 + x * -1) 140 = x + -2x + (-20 + -1x) Reorder the terms: 140 = -20 + x + -2x + -1x Combine like terms: x + -2x = -1x 140 = -20 + -1x + -1x Combine like terms: -1x + -1x = -2x 140 = -20 + -2x Solving 140 = -20 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. 140 + 2x = -20 + -2x + 2x Combine like terms: -2x + 2x = 0 140 + 2x = -20 + 0 140 + 2x = -20 Add '-140' to each side of the equation. 140 + -140 + 2x = -20 + -140 Combine like terms: 140 + -140 = 0 0 + 2x = -20 + -140 2x = -20 + -140 Combine like terms: -20 + -140 = -160 2x = -160 Divide each side by '2'. x = -80 Simplifying x = -80
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