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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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