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Simplifying x + -1y + -21 = 0 Reorder the terms: -21 + x + -1y = 0 Solving -21 + x + -1y = 0 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 = 0 + 21 Reorder the terms: -21 + 21 + x + -1y = 0 + 21 Combine like terms: -21 + 21 = 0 0 + x + -1y = 0 + 21 x + -1y = 0 + 21 Combine like terms: 0 + 21 = 21 x + -1y = 21 Add 'y' to each side of the equation. x + -1y + y = 21 + y Combine like terms: -1y + y = 0 x + 0 = 21 + y x = 21 + y Simplifying x = 21 + y
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