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Simplifying n + n + 1 + n + 2 = 129 Reorder the terms: 1 + 2 + n + n + n = 129 Combine like terms: 1 + 2 = 3 3 + n + n + n = 129 Combine like terms: n + n = 2n 3 + 2n + n = 129 Combine like terms: 2n + n = 3n 3 + 3n = 129 Solving 3 + 3n = 129 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 3n = 129 + -3 Combine like terms: 3 + -3 = 0 0 + 3n = 129 + -3 3n = 129 + -3 Combine like terms: 129 + -3 = 126 3n = 126 Divide each side by '3'. n = 42 Simplifying n = 42
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