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Simplifying 3n + 12 = 72 + -9n Reorder the terms: 12 + 3n = 72 + -9n Solving 12 + 3n = 72 + -9n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '9n' to each side of the equation. 12 + 3n + 9n = 72 + -9n + 9n Combine like terms: 3n + 9n = 12n 12 + 12n = 72 + -9n + 9n Combine like terms: -9n + 9n = 0 12 + 12n = 72 + 0 12 + 12n = 72 Add '-12' to each side of the equation. 12 + -12 + 12n = 72 + -12 Combine like terms: 12 + -12 = 0 0 + 12n = 72 + -12 12n = 72 + -12 Combine like terms: 72 + -12 = 60 12n = 60 Divide each side by '12'. n = 5 Simplifying n = 5
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