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Simplifying n + 4 + 3n + 5 = 21 Reorder the terms: 4 + 5 + n + 3n = 21 Combine like terms: 4 + 5 = 9 9 + n + 3n = 21 Combine like terms: n + 3n = 4n 9 + 4n = 21 Solving 9 + 4n = 21 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 4n = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 4n = 21 + -9 4n = 21 + -9 Combine like terms: 21 + -9 = 12 4n = 12 Divide each side by '4'. n = 3 Simplifying n = 3
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