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Simplifying 21 + 4K = 10k + -21 Reorder the terms: 21 + 4K = -21 + 10k Solving 21 + 4K = -21 + 10k Solving for variable 'K'. Move all terms containing K to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 4K = -21 + -21 + 10k Combine like terms: 21 + -21 = 0 0 + 4K = -21 + -21 + 10k 4K = -21 + -21 + 10k Combine like terms: -21 + -21 = -42 4K = -42 + 10k Divide each side by '4'. K = -10.5 + 2.5k Simplifying K = -10.5 + 2.5k
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