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Simplifying 6n + 4(n + -1) + 5 = 21 Reorder the terms: 6n + 4(-1 + n) + 5 = 21 6n + (-1 * 4 + n * 4) + 5 = 21 6n + (-4 + 4n) + 5 = 21 Reorder the terms: -4 + 5 + 6n + 4n = 21 Combine like terms: -4 + 5 = 1 1 + 6n + 4n = 21 Combine like terms: 6n + 4n = 10n 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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