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Simplifying n + (n + 2) + (n + 7) = 30 Reorder the terms: n + (2 + n) + (n + 7) = 30 Remove parenthesis around (2 + n) n + 2 + n + (n + 7) = 30 Reorder the terms: n + 2 + n + (7 + n) = 30 Remove parenthesis around (7 + n) n + 2 + n + 7 + n = 30 Reorder the terms: 2 + 7 + n + n + n = 30 Combine like terms: 2 + 7 = 9 9 + n + n + n = 30 Combine like terms: n + n = 2n 9 + 2n + n = 30 Combine like terms: 2n + n = 3n 9 + 3n = 30 Solving 9 + 3n = 30 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 3n = 30 + -9 Combine like terms: 9 + -9 = 0 0 + 3n = 30 + -9 3n = 30 + -9 Combine like terms: 30 + -9 = 21 3n = 21 Divide each side by '3'. n = 7 Simplifying n = 7
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