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Simplifying 54 = 9n + -81 Reorder the terms: 54 = -81 + 9n Solving 54 = -81 + 9n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-9n' to each side of the equation. 54 + -9n = -81 + 9n + -9n Combine like terms: 9n + -9n = 0 54 + -9n = -81 + 0 54 + -9n = -81 Add '-54' to each side of the equation. 54 + -54 + -9n = -81 + -54 Combine like terms: 54 + -54 = 0 0 + -9n = -81 + -54 -9n = -81 + -54 Combine like terms: -81 + -54 = -135 -9n = -135 Divide each side by '-9'. n = 15 Simplifying n = 15
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