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Simplifying 3.9k = 2.1k + 17.1 Reorder the terms: 3.9k = 17.1 + 2.1k Solving 3.9k = 17.1 + 2.1k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-2.1k' to each side of the equation. 3.9k + -2.1k = 17.1 + 2.1k + -2.1k Combine like terms: 3.9k + -2.1k = 1.8k 1.8k = 17.1 + 2.1k + -2.1k Combine like terms: 2.1k + -2.1k = 0.0 1.8k = 17.1 + 0.0 1.8k = 17.1 Divide each side by '1.8'. k = 9.5 Simplifying k = 9.5

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