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Simplifying n + (n + 28) = 90 Reorder the terms: n + (28 + n) = 90 Remove parenthesis around (28 + n) n + 28 + n = 90 Reorder the terms: 28 + n + n = 90 Combine like terms: n + n = 2n 28 + 2n = 90 Solving 28 + 2n = 90 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + 2n = 90 + -28 Combine like terms: 28 + -28 = 0 0 + 2n = 90 + -28 2n = 90 + -28 Combine like terms: 90 + -28 = 62 2n = 62 Divide each side by '2'. n = 31 Simplifying n = 31
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