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Simplifying 9(n + 9) + (n + 4) = 0 Reorder the terms: 9(9 + n) + (n + 4) = 0 (9 * 9 + n * 9) + (n + 4) = 0 (81 + 9n) + (n + 4) = 0 Reorder the terms: 81 + 9n + (4 + n) = 0 Remove parenthesis around (4 + n) 81 + 9n + 4 + n = 0 Reorder the terms: 81 + 4 + 9n + n = 0 Combine like terms: 81 + 4 = 85 85 + 9n + n = 0 Combine like terms: 9n + n = 10n 85 + 10n = 0 Solving 85 + 10n = 0 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-85' to each side of the equation. 85 + -85 + 10n = 0 + -85 Combine like terms: 85 + -85 = 0 0 + 10n = 0 + -85 10n = 0 + -85 Combine like terms: 0 + -85 = -85 10n = -85 Divide each side by '10'. n = -8.5 Simplifying n = -8.5
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