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Simplifying 6n + (6n + -9) + 6n + 3n = 180 Reorder the terms: 6n + (-9 + 6n) + 6n + 3n = 180 Remove parenthesis around (-9 + 6n) 6n + -9 + 6n + 6n + 3n = 180 Reorder the terms: -9 + 6n + 6n + 6n + 3n = 180 Combine like terms: 6n + 6n = 12n -9 + 12n + 6n + 3n = 180 Combine like terms: 12n + 6n = 18n -9 + 18n + 3n = 180 Combine like terms: 18n + 3n = 21n -9 + 21n = 180 Solving -9 + 21n = 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 + 21n = 180 + 9 Combine like terms: -9 + 9 = 0 0 + 21n = 180 + 9 21n = 180 + 9 Combine like terms: 180 + 9 = 189 21n = 189 Divide each side by '21'. n = 9 Simplifying n = 9
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