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Simplifying -4(-1 + -7k) + -3 = 85 (-1 * -4 + -7k * -4) + -3 = 85 (4 + 28k) + -3 = 85 Reorder the terms: 4 + -3 + 28k = 85 Combine like terms: 4 + -3 = 1 1 + 28k = 85 Solving 1 + 28k = 85 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 28k = 85 + -1 Combine like terms: 1 + -1 = 0 0 + 28k = 85 + -1 28k = 85 + -1 Combine like terms: 85 + -1 = 84 28k = 84 Divide each side by '28'. k = 3 Simplifying k = 3
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