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Simplifying 3n + 12 + 3n = 42 Reorder the terms: 12 + 3n + 3n = 42 Combine like terms: 3n + 3n = 6n 12 + 6n = 42 Solving 12 + 6n = 42 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 + 6n = 42 + -12 Combine like terms: 12 + -12 = 0 0 + 6n = 42 + -12 6n = 42 + -12 Combine like terms: 42 + -12 = 30 6n = 30 Divide each side by '6'. n = 5 Simplifying n = 5
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