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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 = 117 9n = 117 Divide each side by '9'. n = 13 Simplifying n = 13
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