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Simplifying 120 = x + (x + -20) Reorder the terms: 120 = x + (-20 + x) Remove parenthesis around (-20 + x) 120 = x + -20 + x Reorder the terms: 120 = -20 + x + x Combine like terms: x + x = 2x 120 = -20 + 2x Solving 120 = -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. 120 + -2x = -20 + 2x + -2x Combine like terms: 2x + -2x = 0 120 + -2x = -20 + 0 120 + -2x = -20 Add '-120' to each side of the equation. 120 + -120 + -2x = -20 + -120 Combine like terms: 120 + -120 = 0 0 + -2x = -20 + -120 -2x = -20 + -120 Combine like terms: -20 + -120 = -140 -2x = -140 Divide each side by '-2'. x = 70 Simplifying x = 70
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