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Simplifying -81 = -9(-8 + n) -81 = (-8 * -9 + n * -9) -81 = (72 + -9n) Solving -81 = 72 + -9n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '9n' to each side of the equation. -81 + 9n = 72 + -9n + 9n Combine like terms: -9n + 9n = 0 -81 + 9n = 72 + 0 -81 + 9n = 72 Add '81' to each side of the equation. -81 + 81 + 9n = 72 + 81 Combine like terms: -81 + 81 = 0 0 + 9n = 72 + 81 9n = 72 + 81 Combine like terms: 72 + 81 = 153 9n = 153 Divide each side by '9'. n = 17 Simplifying n = 17
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