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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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