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Simplifying -9n + 12n + (-9) = 18 -9n + 12n + -9 = 18 Reorder the terms: -9 + -9n + 12n = 18 Combine like terms: -9n + 12n = 3n -9 + 3n = 18 Solving -9 + 3n = 18 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 3n = 18 + 9 Combine like terms: -9 + 9 = 0 0 + 3n = 18 + 9 3n = 18 + 9 Combine like terms: 18 + 9 = 27 3n = 27 Divide each side by '3'. n = 9 Simplifying n = 9

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