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Simplifying n + (2n + -15) = 120 Reorder the terms: n + (-15 + 2n) = 120 Remove parenthesis around (-15 + 2n) n + -15 + 2n = 120 Reorder the terms: -15 + n + 2n = 120 Combine like terms: n + 2n = 3n -15 + 3n = 120 Solving -15 + 3n = 120 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 3n = 120 + 15 Combine like terms: -15 + 15 = 0 0 + 3n = 120 + 15 3n = 120 + 15 Combine like terms: 120 + 15 = 135 3n = 135 Divide each side by '3'. n = 45 Simplifying n = 45
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