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Simplifying n + n + 2 + 4 = 84 Reorder the terms: 2 + 4 + n + n = 84 Combine like terms: 2 + 4 = 6 6 + n + n = 84 Combine like terms: n + n = 2n 6 + 2n = 84 Solving 6 + 2n = 84 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 + 2n = 84 + -6 Combine like terms: 6 + -6 = 0 0 + 2n = 84 + -6 2n = 84 + -6 Combine like terms: 84 + -6 = 78 2n = 78 Divide each side by '2'. n = 39 Simplifying n = 39
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