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Simplifying -20k + 13k + -19 = 9 Reorder the terms: -19 + -20k + 13k = 9 Combine like terms: -20k + 13k = -7k -19 + -7k = 9 Solving -19 + -7k = 9 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '19' to each side of the equation. -19 + 19 + -7k = 9 + 19 Combine like terms: -19 + 19 = 0 0 + -7k = 9 + 19 -7k = 9 + 19 Combine like terms: 9 + 19 = 28 -7k = 28 Divide each side by '-7'. k = -4 Simplifying k = -4
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