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Simplifying 21 = k + -8k Combine like terms: k + -8k = -7k 21 = -7k Solving 21 = -7k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '7k' to each side of the equation. 21 + 7k = -7k + 7k Combine like terms: -7k + 7k = 0 21 + 7k = 0 Add '-21' to each side of the equation. 21 + -21 + 7k = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 7k = 0 + -21 7k = 0 + -21 Combine like terms: 0 + -21 = -21 7k = -21 Divide each side by '7'. k = -3 Simplifying k = -3
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