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Simplifying -4x + -5y + 9z = 18 Solving -4x + -5y + 9z = 18 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5y' to each side of the equation. -4x + -5y + 5y + 9z = 18 + 5y Combine like terms: -5y + 5y = 0 -4x + 0 + 9z = 18 + 5y -4x + 9z = 18 + 5y Add '-9z' to each side of the equation. -4x + 9z + -9z = 18 + 5y + -9z Combine like terms: 9z + -9z = 0 -4x + 0 = 18 + 5y + -9z -4x = 18 + 5y + -9z Divide each side by '-4'. x = -4.5 + -1.25y + 2.25z Simplifying x = -4.5 + -1.25y + 2.25z
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