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Simplifying 3n + -12 = 42 Reorder the terms: -12 + 3n = 42 Solving -12 + 3n = 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 + 3n = 42 + 12 Combine like terms: -12 + 12 = 0 0 + 3n = 42 + 12 3n = 42 + 12 Combine like terms: 42 + 12 = 54 3n = 54 Divide each side by '3'. n = 18 Simplifying n = 18
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