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Simplifying 4x + 2y + -1z = 21 Solving 4x + 2y + -1z = 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. 4x + 2y + -2y + -1z = 21 + -2y Combine like terms: 2y + -2y = 0 4x + 0 + -1z = 21 + -2y 4x + -1z = 21 + -2y Add 'z' to each side of the equation. 4x + -1z + z = 21 + -2y + z Combine like terms: -1z + z = 0 4x + 0 = 21 + -2y + z 4x = 21 + -2y + z Divide each side by '4'. x = 5.25 + -0.5y + 0.25z Simplifying x = 5.25 + -0.5y + 0.25z
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