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Simplifying 9(n + -12) = 81 Reorder the terms: 9(-12 + n) = 81 (-12 * 9 + n * 9) = 81 (-108 + 9n) = 81 Solving -108 + 9n = 81 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '108' to each side of the equation. -108 + 108 + 9n = 81 + 108 Combine like terms: -108 + 108 = 0 0 + 9n = 81 + 108 9n = 81 + 108 Combine like terms: 81 + 108 = 189 9n = 189 Divide each side by '9'. n = 21 Simplifying n = 21
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