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Simplifying -5k + 4 = -21 Reorder the terms: 4 + -5k = -21 Solving 4 + -5k = -21 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -5k = -21 + -4 Combine like terms: 4 + -4 = 0 0 + -5k = -21 + -4 -5k = -21 + -4 Combine like terms: -21 + -4 = -25 -5k = -25 Divide each side by '-5'. k = 5 Simplifying k = 5
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