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Simplifying 7k + -21 = 3k + -21 Reorder the terms: -21 + 7k = 3k + -21 Reorder the terms: -21 + 7k = -21 + 3k Add '21' to each side of the equation. -21 + 21 + 7k = -21 + 21 + 3k Combine like terms: -21 + 21 = 0 0 + 7k = -21 + 21 + 3k 7k = -21 + 21 + 3k Combine like terms: -21 + 21 = 0 7k = 0 + 3k 7k = 3k Solving 7k = 3k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-3k' to each side of the equation. 7k + -3k = 3k + -3k Combine like terms: 7k + -3k = 4k 4k = 3k + -3k Combine like terms: 3k + -3k = 0 4k = 0 Divide each side by '4'. k = 0 Simplifying k = 0
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