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Simplifying -7n + 3(7n + -1) = 81 Reorder the terms: -7n + 3(-1 + 7n) = 81 -7n + (-1 * 3 + 7n * 3) = 81 -7n + (-3 + 21n) = 81 Reorder the terms: -3 + -7n + 21n = 81 Combine like terms: -7n + 21n = 14n -3 + 14n = 81 Solving -3 + 14n = 81 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 + 14n = 81 + 3 Combine like terms: -3 + 3 = 0 0 + 14n = 81 + 3 14n = 81 + 3 Combine like terms: 81 + 3 = 84 14n = 84 Divide each side by '14'. n = 6 Simplifying n = 6
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