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