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Simplifying 81 = 3(3 + -4n) 81 = (3 * 3 + -4n * 3) 81 = (9 + -12n) Solving 81 = 9 + -12n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '12n' to each side of the equation. 81 + 12n = 9 + -12n + 12n Combine like terms: -12n + 12n = 0 81 + 12n = 9 + 0 81 + 12n = 9 Add '-81' to each side of the equation. 81 + -81 + 12n = 9 + -81 Combine like terms: 81 + -81 = 0 0 + 12n = 9 + -81 12n = 9 + -81 Combine like terms: 9 + -81 = -72 12n = -72 Divide each side by '12'. n = -6 Simplifying n = -6
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