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Simplifying x + (20 + -1y) = 12 Remove parenthesis around (20 + -1y) x + 20 + -1y = 12 Reorder the terms: 20 + x + -1y = 12 Solving 20 + x + -1y = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + x + -20 + -1y = 12 + -20 Reorder the terms: 20 + -20 + x + -1y = 12 + -20 Combine like terms: 20 + -20 = 0 0 + x + -1y = 12 + -20 x + -1y = 12 + -20 Combine like terms: 12 + -20 = -8 x + -1y = -8 Add 'y' to each side of the equation. x + -1y + y = -8 + y Combine like terms: -1y + y = 0 x + 0 = -8 + y x = -8 + y Simplifying x = -8 + y
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