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Simplifying (n + 9) + 2n = 84 Reorder the terms: (9 + n) + 2n = 84 Remove parenthesis around (9 + n) 9 + n + 2n = 84 Combine like terms: n + 2n = 3n 9 + 3n = 84 Solving 9 + 3n = 84 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 = 84 + -9 Combine like terms: 9 + -9 = 0 0 + 3n = 84 + -9 3n = 84 + -9 Combine like terms: 84 + -9 = 75 3n = 75 Divide each side by '3'. n = 25 Simplifying n = 25
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