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Simplifying n + (n + 66) = 400 Reorder the terms: n + (66 + n) = 400 Remove parenthesis around (66 + n) n + 66 + n = 400 Reorder the terms: 66 + n + n = 400 Combine like terms: n + n = 2n 66 + 2n = 400 Solving 66 + 2n = 400 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-66' to each side of the equation. 66 + -66 + 2n = 400 + -66 Combine like terms: 66 + -66 = 0 0 + 2n = 400 + -66 2n = 400 + -66 Combine like terms: 400 + -66 = 334 2n = 334 Divide each side by '2'. n = 167 Simplifying n = 167
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