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Simplifying 5n + 4n + 7 + 8 = 42 Reorder the terms: 7 + 8 + 5n + 4n = 42 Combine like terms: 7 + 8 = 15 15 + 5n + 4n = 42 Combine like terms: 5n + 4n = 9n 15 + 9n = 42 Solving 15 + 9n = 42 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 9n = 42 + -15 Combine like terms: 15 + -15 = 0 0 + 9n = 42 + -15 9n = 42 + -15 Combine like terms: 42 + -15 = 27 9n = 27 Divide each side by '9'. n = 3 Simplifying n = 3
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