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Simplifying (n + -1) + n + (n + 1) = 81 Reorder the terms: (-1 + n) + n + (n + 1) = 81 Remove parenthesis around (-1 + n) -1 + n + n + (n + 1) = 81 Reorder the terms: -1 + n + n + (1 + n) = 81 Remove parenthesis around (1 + n) -1 + n + n + 1 + n = 81 Reorder the terms: -1 + 1 + n + n + n = 81 Combine like terms: -1 + 1 = 0 0 + n + n + n = 81 n + n + n = 81 Combine like terms: n + n = 2n 2n + n = 81 Combine like terms: 2n + n = 3n 3n = 81 Solving 3n = 81 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Divide each side by '3'. n = 27 Simplifying n = 27
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