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Simplifying -7k + -4 = 21 Reorder the terms: -4 + -7k = 21 Solving -4 + -7k = 21 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -7k = 21 + 4 Combine like terms: -4 + 4 = 0 0 + -7k = 21 + 4 -7k = 21 + 4 Combine like terms: 21 + 4 = 25 -7k = 25 Divide each side by '-7'. k = -3.571428571 Simplifying k = -3.571428571
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