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Simplifying 5x + -1y + z = 21 Solving 5x + -1y + z = 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. 5x + -1y + y + z = 21 + y Combine like terms: -1y + y = 0 5x + 0 + z = 21 + y 5x + z = 21 + y Add '-1z' to each side of the equation. 5x + z + -1z = 21 + y + -1z Combine like terms: z + -1z = 0 5x + 0 = 21 + y + -1z 5x = 21 + y + -1z Divide each side by '5'. x = 4.2 + 0.2y + -0.2z Simplifying x = 4.2 + 0.2y + -0.2z
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