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Simplifying -3n + 12 + -9n = 0 Reorder the terms: 12 + -3n + -9n = 0 Combine like terms: -3n + -9n = -12n 12 + -12n = 0 Solving 12 + -12n = 0 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -12n = 0 + -12 Combine like terms: 12 + -12 = 0 0 + -12n = 0 + -12 -12n = 0 + -12 Combine like terms: 0 + -12 = -12 -12n = -12 Divide each side by '-12'. n = 1 Simplifying n = 1
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