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Simplifying 7k + -14 + -2k = 21 Reorder the terms: -14 + 7k + -2k = 21 Combine like terms: 7k + -2k = 5k -14 + 5k = 21 Solving -14 + 5k = 21 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + 5k = 21 + 14 Combine like terms: -14 + 14 = 0 0 + 5k = 21 + 14 5k = 21 + 14 Combine like terms: 21 + 14 = 35 5k = 35 Divide each side by '5'. k = 7 Simplifying k = 7
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