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Simplifying 3n + 9(2n + 10) = 0 Reorder the terms: 3n + 9(10 + 2n) = 0 3n + (10 * 9 + 2n * 9) = 0 3n + (90 + 18n) = 0 Reorder the terms: 90 + 3n + 18n = 0 Combine like terms: 3n + 18n = 21n 90 + 21n = 0 Solving 90 + 21n = 0 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + -90 + 21n = 0 + -90 Combine like terms: 90 + -90 = 0 0 + 21n = 0 + -90 21n = 0 + -90 Combine like terms: 0 + -90 = -90 21n = -90 Divide each side by '21'. n = -4.285714286 Simplifying n = -4.285714286
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