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Simplifying x + -2y = -21 Solving x + -2y = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2y' to each side of the equation. x + -2y + 2y = -21 + 2y Combine like terms: -2y + 2y = 0 x + 0 = -21 + 2y x = -21 + 2y Simplifying x = -21 + 2y
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