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Simplifying (n + 18) + (2n) = 90 Reorder the terms: (18 + n) + (2n) = 90 Remove parenthesis around (18 + n) 18 + n + (2n) = 90 Combine like terms: n + (2n) = 3n 18 + 3n = 90 Solving 18 + 3n = 90 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 3n = 90 + -18 Combine like terms: 18 + -18 = 0 0 + 3n = 90 + -18 3n = 90 + -18 Combine like terms: 90 + -18 = 72 3n = 72 Divide each side by '3'. n = 24 Simplifying n = 24
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