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Simplifying 2k + -8 + -7k = 21 Reorder the terms: -8 + 2k + -7k = 21 Combine like terms: 2k + -7k = -5k -8 + -5k = 21 Solving -8 + -5k = 21 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + -5k = 21 + 8 Combine like terms: -8 + 8 = 0 0 + -5k = 21 + 8 -5k = 21 + 8 Combine like terms: 21 + 8 = 29 -5k = 29 Divide each side by '-5'. k = -5.8 Simplifying k = -5.8
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