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Simplifying n + (n + 20) = 100 Reorder the terms: n + (20 + n) = 100 Remove parenthesis around (20 + n) n + 20 + n = 100 Reorder the terms: 20 + n + n = 100 Combine like terms: n + n = 2n 20 + 2n = 100 Solving 20 + 2n = 100 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 2n = 100 + -20 Combine like terms: 20 + -20 = 0 0 + 2n = 100 + -20 2n = 100 + -20 Combine like terms: 100 + -20 = 80 2n = 80 Divide each side by '2'. n = 40 Simplifying n = 40
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