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Simplifying 9 + 4 = 8(5 + K) Combine like terms: 9 + 4 = 13 13 = 8(5 + K) 13 = (5 * 8 + K * 8) 13 = (40 + 8K) Solving 13 = 40 + 8K Solving for variable 'K'. Move all terms containing K to the left, all other terms to the right. Add '-8K' to each side of the equation. 13 + -8K = 40 + 8K + -8K Combine like terms: 8K + -8K = 0 13 + -8K = 40 + 0 13 + -8K = 40 Add '-13' to each side of the equation. 13 + -13 + -8K = 40 + -13 Combine like terms: 13 + -13 = 0 0 + -8K = 40 + -13 -8K = 40 + -13 Combine like terms: 40 + -13 = 27 -8K = 27 Divide each side by '-8'. K = -3.375 Simplifying K = -3.375

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