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Simplifying (5n + 15) + (4n + 21) = 180 Reorder the terms: (15 + 5n) + (4n + 21) = 180 Remove parenthesis around (15 + 5n) 15 + 5n + (4n + 21) = 180 Reorder the terms: 15 + 5n + (21 + 4n) = 180 Remove parenthesis around (21 + 4n) 15 + 5n + 21 + 4n = 180 Reorder the terms: 15 + 21 + 5n + 4n = 180 Combine like terms: 15 + 21 = 36 36 + 5n + 4n = 180 Combine like terms: 5n + 4n = 9n 36 + 9n = 180 Solving 36 + 9n = 180 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-36' to each side of the equation. 36 + -36 + 9n = 180 + -36 Combine like terms: 36 + -36 = 0 0 + 9n = 180 + -36 9n = 180 + -36 Combine like terms: 180 + -36 = 144 9n = 144 Divide each side by '9'. n = 16 Simplifying n = 16
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