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Simplifying (n + 4) * 9 = 81 Reorder the terms: (4 + n) * 9 = 81 Reorder the terms for easier multiplication: 9(4 + n) = 81 (4 * 9 + n * 9) = 81 (36 + 9n) = 81 Solving 36 + 9n = 81 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-36' to each side of the equation. 36 + -36 + 9n = 81 + -36 Combine like terms: 36 + -36 = 0 0 + 9n = 81 + -36 9n = 81 + -36 Combine like terms: 81 + -36 = 45 9n = 45 Divide each side by '9'. n = 5 Simplifying n = 5
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