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Simplifying 85 = -5(3 + -4K) 85 = (3 * -5 + -4K * -5) 85 = (-15 + 20K) Solving 85 = -15 + 20K Solving for variable 'K'. Move all terms containing K to the left, all other terms to the right. Add '-20K' to each side of the equation. 85 + -20K = -15 + 20K + -20K Combine like terms: 20K + -20K = 0 85 + -20K = -15 + 0 85 + -20K = -15 Add '-85' to each side of the equation. 85 + -85 + -20K = -15 + -85 Combine like terms: 85 + -85 = 0 0 + -20K = -15 + -85 -20K = -15 + -85 Combine like terms: -15 + -85 = -100 -20K = -100 Divide each side by '-20'. K = 5 Simplifying K = 5
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