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Simplifying x + y + -2z = 21 Solving x + y + -2z = 21 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 + -2z = 21 + -1y Combine like terms: y + -1y = 0 x + 0 + -2z = 21 + -1y x + -2z = 21 + -1y Add '2z' to each side of the equation. x + -2z + 2z = 21 + -1y + 2z Combine like terms: -2z + 2z = 0 x + 0 = 21 + -1y + 2z x = 21 + -1y + 2z Simplifying x = 21 + -1y + 2z
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