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Simplifying -7n + 4(1 + -1n) = 81 -7n + (1 * 4 + -1n * 4) = 81 -7n + (4 + -4n) = 81 Reorder the terms: 4 + -7n + -4n = 81 Combine like terms: -7n + -4n = -11n 4 + -11n = 81 Solving 4 + -11n = 81 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -11n = 81 + -4 Combine like terms: 4 + -4 = 0 0 + -11n = 81 + -4 -11n = 81 + -4 Combine like terms: 81 + -4 = 77 -11n = 77 Divide each side by '-11'. n = -7 Simplifying n = -7
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