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Simplifying 2x + -1y + 5z = 21 Solving 2x + -1y + 5z = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'y' to each side of the equation. 2x + -1y + y + 5z = 21 + y Combine like terms: -1y + y = 0 2x + 0 + 5z = 21 + y 2x + 5z = 21 + y Add '-5z' to each side of the equation. 2x + 5z + -5z = 21 + y + -5z Combine like terms: 5z + -5z = 0 2x + 0 = 21 + y + -5z 2x = 21 + y + -5z Divide each side by '2'. x = 10.5 + 0.5y + -2.5z Simplifying x = 10.5 + 0.5y + -2.5z
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