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Simplifying 81 = 72x + 9y Solving 81 = 72x + 9y Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-72x' to each side of the equation. 81 + -72x = 72x + -72x + 9y Combine like terms: 72x + -72x = 0 81 + -72x = 0 + 9y 81 + -72x = 9y Add '-81' to each side of the equation. 81 + -81 + -72x = -81 + 9y Combine like terms: 81 + -81 = 0 0 + -72x = -81 + 9y -72x = -81 + 9y Divide each side by '-72'. x = 1.125 + -0.125y Simplifying x = 1.125 + -0.125y
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