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Simplifying 9(n + 7) + 3(n + -2) = 0 Reorder the terms: 9(7 + n) + 3(n + -2) = 0 (7 * 9 + n * 9) + 3(n + -2) = 0 (63 + 9n) + 3(n + -2) = 0 Reorder the terms: 63 + 9n + 3(-2 + n) = 0 63 + 9n + (-2 * 3 + n * 3) = 0 63 + 9n + (-6 + 3n) = 0 Reorder the terms: 63 + -6 + 9n + 3n = 0 Combine like terms: 63 + -6 = 57 57 + 9n + 3n = 0 Combine like terms: 9n + 3n = 12n 57 + 12n = 0 Solving 57 + 12n = 0 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-57' to each side of the equation. 57 + -57 + 12n = 0 + -57 Combine like terms: 57 + -57 = 0 0 + 12n = 0 + -57 12n = 0 + -57 Combine like terms: 0 + -57 = -57 12n = -57 Divide each side by '12'. n = -4.75 Simplifying n = -4.75
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