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Simplifying (n) + (2n + 21) = 180 n + (2n + 21) = 180 Reorder the terms: n + (21 + 2n) = 180 Remove parenthesis around (21 + 2n) n + 21 + 2n = 180 Reorder the terms: 21 + n + 2n = 180 Combine like terms: n + 2n = 3n 21 + 3n = 180 Solving 21 + 3n = 180 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 3n = 180 + -21 Combine like terms: 21 + -21 = 0 0 + 3n = 180 + -21 3n = 180 + -21 Combine like terms: 180 + -21 = 159 3n = 159 Divide each side by '3'. n = 53 Simplifying n = 53
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