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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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