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Simplifying -3(-7k + -8) = -81 Reorder the terms: -3(-8 + -7k) = -81 (-8 * -3 + -7k * -3) = -81 (24 + 21k) = -81 Solving 24 + 21k = -81 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-24' to each side of the equation. 24 + -24 + 21k = -81 + -24 Combine like terms: 24 + -24 = 0 0 + 21k = -81 + -24 21k = -81 + -24 Combine like terms: -81 + -24 = -105 21k = -105 Divide each side by '21'. k = -5 Simplifying k = -5
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