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Simplifying 3 + 2(5n + -1) = 21 Reorder the terms: 3 + 2(-1 + 5n) = 21 3 + (-1 * 2 + 5n * 2) = 21 3 + (-2 + 10n) = 21 Combine like terms: 3 + -2 = 1 1 + 10n = 21 Solving 1 + 10n = 21 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 10n = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 10n = 21 + -1 10n = 21 + -1 Combine like terms: 21 + -1 = 20 10n = 20 Divide each side by '10'. n = 2 Simplifying n = 2
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