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Simplifying 81 = -7 + 4(7 + -3n) 81 = -7 + (7 * 4 + -3n * 4) 81 = -7 + (28 + -12n) Combine like terms: -7 + 28 = 21 81 = 21 + -12n Solving 81 = 21 + -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 = 21 + -12n + 12n Combine like terms: -12n + 12n = 0 81 + 12n = 21 + 0 81 + 12n = 21 Add '-81' to each side of the equation. 81 + -81 + 12n = 21 + -81 Combine like terms: 81 + -81 = 0 0 + 12n = 21 + -81 12n = 21 + -81 Combine like terms: 21 + -81 = -60 12n = -60 Divide each side by '12'. n = -5 Simplifying n = -5
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