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Simplifying 3(K + 5) = 21 Reorder the terms: 3(5 + K) = 21 (5 * 3 + K * 3) = 21 (15 + 3K) = 21 Solving 15 + 3K = 21 Solving for variable 'K'. Move all terms containing K to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 3K = 21 + -15 Combine like terms: 15 + -15 = 0 0 + 3K = 21 + -15 3K = 21 + -15 Combine like terms: 21 + -15 = 6 3K = 6 Divide each side by '3'. K = 2 Simplifying K = 2
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