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