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Simplifying N + 3(N + 3) = 81 Reorder the terms: N + 3(3 + N) = 81 N + (3 * 3 + N * 3) = 81 N + (9 + 3N) = 81 Reorder the terms: 9 + N + 3N = 81 Combine like terms: N + 3N = 4N 9 + 4N = 81 Solving 9 + 4N = 81 Solving for variable 'N'. Move all terms containing N to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 4N = 81 + -9 Combine like terms: 9 + -9 = 0 0 + 4N = 81 + -9 4N = 81 + -9 Combine like terms: 81 + -9 = 72 4N = 72 Divide each side by '4'. N = 18 Simplifying N = 18
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