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Simplifying x + (x + -30) + y = 123 Reorder the terms: x + (-30 + x) + y = 123 Remove parenthesis around (-30 + x) x + -30 + x + y = 123 Reorder the terms: -30 + x + x + y = 123 Combine like terms: x + x = 2x -30 + 2x + y = 123 Solving -30 + 2x + y = 123 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 2x + 30 + y = 123 + 30 Reorder the terms: -30 + 30 + 2x + y = 123 + 30 Combine like terms: -30 + 30 = 0 0 + 2x + y = 123 + 30 2x + y = 123 + 30 Combine like terms: 123 + 30 = 153 2x + y = 153 Add '-1y' to each side of the equation. 2x + y + -1y = 153 + -1y Combine like terms: y + -1y = 0 2x + 0 = 153 + -1y 2x = 153 + -1y Divide each side by '2'. x = 76.5 + -0.5y Simplifying x = 76.5 + -0.5y
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