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Simplifying 3n + (n + 9) = 180 Reorder the terms: 3n + (9 + n) = 180 Remove parenthesis around (9 + n) 3n + 9 + n = 180 Reorder the terms: 9 + 3n + n = 180 Combine like terms: 3n + n = 4n 9 + 4n = 180 Solving 9 + 4n = 180 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 + 4n = 180 + -9 Combine like terms: 9 + -9 = 0 0 + 4n = 180 + -9 4n = 180 + -9 Combine like terms: 180 + -9 = 171 4n = 171 Divide each side by '4'. n = 42.75 Simplifying n = 42.75
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