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Simplifying n + (n + 3) = 15 Reorder the terms: n + (3 + n) = 15 Remove parenthesis around (3 + n) n + 3 + n = 15 Reorder the terms: 3 + n + n = 15 Combine like terms: n + n = 2n 3 + 2n = 15 Solving 3 + 2n = 15 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 2n = 15 + -3 Combine like terms: 3 + -3 = 0 0 + 2n = 15 + -3 2n = 15 + -3 Combine like terms: 15 + -3 = 12 2n = 12 Divide each side by '2'. n = 6 Simplifying n = 6
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