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Simplifying n + (n + 1) + (n + 3) = -399 Reorder the terms: n + (1 + n) + (n + 3) = -399 Remove parenthesis around (1 + n) n + 1 + n + (n + 3) = -399 Reorder the terms: n + 1 + n + (3 + n) = -399 Remove parenthesis around (3 + n) n + 1 + n + 3 + n = -399 Reorder the terms: 1 + 3 + n + n + n = -399 Combine like terms: 1 + 3 = 4 4 + n + n + n = -399 Combine like terms: n + n = 2n 4 + 2n + n = -399 Combine like terms: 2n + n = 3n 4 + 3n = -399 Solving 4 + 3n = -399 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 3n = -399 + -4 Combine like terms: 4 + -4 = 0 0 + 3n = -399 + -4 3n = -399 + -4 Combine like terms: -399 + -4 = -403 3n = -403 Divide each side by '3'. n = -134.3333333 Simplifying n = -134.3333333
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