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Simplifying x + (21 + -1y) = 13 Remove parenthesis around (21 + -1y) x + 21 + -1y = 13 Reorder the terms: 21 + x + -1y = 13 Solving 21 + x + -1y = 13 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + x + -21 + -1y = 13 + -21 Reorder the terms: 21 + -21 + x + -1y = 13 + -21 Combine like terms: 21 + -21 = 0 0 + x + -1y = 13 + -21 x + -1y = 13 + -21 Combine like terms: 13 + -21 = -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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