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Simplifying -4x + 9y = 81 Solving -4x + 9y = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9y' to each side of the equation. -4x + 9y + -9y = 81 + -9y Combine like terms: 9y + -9y = 0 -4x + 0 = 81 + -9y -4x = 81 + -9y Divide each side by '-4'. x = -20.25 + 2.25y Simplifying x = -20.25 + 2.25y
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