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Simplifying x + y = 21 + -12 Combine like terms: 21 + -12 = 9 x + y = 9 Solving x + y = 9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1y' to each side of the equation. x + y + -1y = 9 + -1y Combine like terms: y + -1y = 0 x + 0 = 9 + -1y x = 9 + -1y Simplifying x = 9 + -1y
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