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Simplifying 5k + 1 + 2k = -20 Reorder the terms: 1 + 5k + 2k = -20 Combine like terms: 5k + 2k = 7k 1 + 7k = -20 Solving 1 + 7k = -20 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 + 7k = -20 + -1 Combine like terms: 1 + -1 = 0 0 + 7k = -20 + -1 7k = -20 + -1 Combine like terms: -20 + -1 = -21 7k = -21 Divide each side by '7'. k = -3 Simplifying k = -3
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