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Simplifying (n + 4) * 3 = 21 Reorder the terms: (4 + n) * 3 = 21 Reorder the terms for easier multiplication: 3(4 + n) = 21 (4 * 3 + n * 3) = 21 (12 + 3n) = 21 Solving 12 + 3n = 21 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 3n = 21 + -12 Combine like terms: 12 + -12 = 0 0 + 3n = 21 + -12 3n = 21 + -12 Combine like terms: 21 + -12 = 9 3n = 9 Divide each side by '3'. n = 3 Simplifying n = 3
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