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Simplifying 21 + -4k = -3k Solving 21 + -4k = -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. 21 + -4k + 3k = -3k + 3k Combine like terms: -4k + 3k = -1k 21 + -1k = -3k + 3k Combine like terms: -3k + 3k = 0 21 + -1k = 0 Add '-21' to each side of the equation. 21 + -21 + -1k = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -1k = 0 + -21 -1k = 0 + -21 Combine like terms: 0 + -21 = -21 -1k = -21 Divide each side by '-1'. k = 21 Simplifying k = 21
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