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Simplifying (n + 3) * 3 = 21 Reorder the terms: (3 + n) * 3 = 21 Reorder the terms for easier multiplication: 3(3 + n) = 21 (3 * 3 + n * 3) = 21 (9 + 3n) = 21 Solving 9 + 3n = 21 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 + 3n = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 3n = 21 + -9 3n = 21 + -9 Combine like terms: 21 + -9 = 12 3n = 12 Divide each side by '3'. n = 4 Simplifying n = 4
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