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Simplifying 3n + 9(2n + 6) = 0 Reorder the terms: 3n + 9(6 + 2n) = 0 3n + (6 * 9 + 2n * 9) = 0 3n + (54 + 18n) = 0 Reorder the terms: 54 + 3n + 18n = 0 Combine like terms: 3n + 18n = 21n 54 + 21n = 0 Solving 54 + 21n = 0 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-54' to each side of the equation. 54 + -54 + 21n = 0 + -54 Combine like terms: 54 + -54 = 0 0 + 21n = 0 + -54 21n = 0 + -54 Combine like terms: 0 + -54 = -54 21n = -54 Divide each side by '21'. n = -2.571428571 Simplifying n = -2.571428571
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