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Simplifying 3(2n + 1) + -2n = 21 Reorder the terms: 3(1 + 2n) + -2n = 21 (1 * 3 + 2n * 3) + -2n = 21 (3 + 6n) + -2n = 21 Combine like terms: 6n + -2n = 4n 3 + 4n = 21 Solving 3 + 4n = 21 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 + 4n = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 4n = 21 + -3 4n = 21 + -3 Combine like terms: 21 + -3 = 18 4n = 18 Divide each side by '4'. n = 4.5 Simplifying n = 4.5
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