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Simplifying 7k + 19 + 3k = 81 Reorder the terms: 19 + 7k + 3k = 81 Combine like terms: 7k + 3k = 10k 19 + 10k = 81 Solving 19 + 10k = 81 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-19' to each side of the equation. 19 + -19 + 10k = 81 + -19 Combine like terms: 19 + -19 = 0 0 + 10k = 81 + -19 10k = 81 + -19 Combine like terms: 81 + -19 = 62 10k = 62 Divide each side by '10'. k = 6.2 Simplifying k = 6.2
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