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Simplifying K + 3(K + -4) = 20 Reorder the terms: K + 3(-4 + K) = 20 K + (-4 * 3 + K * 3) = 20 K + (-12 + 3K) = 20 Reorder the terms: -12 + K + 3K = 20 Combine like terms: K + 3K = 4K -12 + 4K = 20 Solving -12 + 4K = 20 Solving for variable 'K'. Move all terms containing K to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 4K = 20 + 12 Combine like terms: -12 + 12 = 0 0 + 4K = 20 + 12 4K = 20 + 12 Combine like terms: 20 + 12 = 32 4K = 32 Divide each side by '4'. K = 8 Simplifying K = 8
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