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Simplifying 2n + 3(n + 3) = 21 Reorder the terms: 2n + 3(3 + n) = 21 2n + (3 * 3 + n * 3) = 21 2n + (9 + 3n) = 21 Reorder the terms: 9 + 2n + 3n = 21 Combine like terms: 2n + 3n = 5n 9 + 5n = 21 Solving 9 + 5n = 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 + 5n = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 5n = 21 + -9 5n = 21 + -9 Combine like terms: 21 + -9 = 12 5n = 12 Divide each side by '5'. n = 2.4 Simplifying n = 2.4
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