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Simplifying 81 = 7x + 13y Solving 81 = 7x + 13y Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 81 + -7x = 7x + -7x + 13y Combine like terms: 7x + -7x = 0 81 + -7x = 0 + 13y 81 + -7x = 13y Add '-81' to each side of the equation. 81 + -81 + -7x = -81 + 13y Combine like terms: 81 + -81 = 0 0 + -7x = -81 + 13y -7x = -81 + 13y Divide each side by '-7'. x = 11.57142857 + -1.857142857y Simplifying x = 11.57142857 + -1.857142857y
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