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Simplifying n + (12 + n) = 84 Remove parenthesis around (12 + n) n + 12 + n = 84 Reorder the terms: 12 + n + n = 84 Combine like terms: n + n = 2n 12 + 2n = 84 Solving 12 + 2n = 84 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 2n = 84 + -12 Combine like terms: 12 + -12 = 0 0 + 2n = 84 + -12 2n = 84 + -12 Combine like terms: 84 + -12 = 72 2n = 72 Divide each side by '2'. n = 36 Simplifying n = 36
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