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Simplifying n + n + 2 + n + 4 = 399 Reorder the terms: 2 + 4 + n + n + n = 399 Combine like terms: 2 + 4 = 6 6 + n + n + n = 399 Combine like terms: n + n = 2n 6 + 2n + n = 399 Combine like terms: 2n + n = 3n 6 + 3n = 399 Solving 6 + 3n = 399 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + 3n = 399 + -6 Combine like terms: 6 + -6 = 0 0 + 3n = 399 + -6 3n = 399 + -6 Combine like terms: 399 + -6 = 393 3n = 393 Divide each side by '3'. n = 131 Simplifying n = 131
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