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Simplifying (3n + -1) * 2 + 5 = 21 Reorder the terms: (-1 + 3n) * 2 + 5 = 21 Reorder the terms for easier multiplication: 2(-1 + 3n) + 5 = 21 (-1 * 2 + 3n * 2) + 5 = 21 (-2 + 6n) + 5 = 21 Reorder the terms: -2 + 5 + 6n = 21 Combine like terms: -2 + 5 = 3 3 + 6n = 21 Solving 3 + 6n = 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 + 6n = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 6n = 21 + -3 6n = 21 + -3 Combine like terms: 21 + -3 = 18 6n = 18 Divide each side by '6'. n = 3 Simplifying n = 3
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