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Simplifying -3n + 7(1 + 3n) = 115 -3n + (1 * 7 + 3n * 7) = 115 -3n + (7 + 21n) = 115 Reorder the terms: 7 + -3n + 21n = 115 Combine like terms: -3n + 21n = 18n 7 + 18n = 115 Solving 7 + 18n = 115 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 18n = 115 + -7 Combine like terms: 7 + -7 = 0 0 + 18n = 115 + -7 18n = 115 + -7 Combine like terms: 115 + -7 = 108 18n = 108 Divide each side by '18'. n = 6 Simplifying n = 6
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