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Simplifying k + -1 + -5k = -21 Reorder the terms: -1 + k + -5k = -21 Combine like terms: k + -5k = -4k -1 + -4k = -21 Solving -1 + -4k = -21 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -4k = -21 + 1 Combine like terms: -1 + 1 = 0 0 + -4k = -21 + 1 -4k = -21 + 1 Combine like terms: -21 + 1 = -20 -4k = -20 Divide each side by '-4'. k = 5 Simplifying k = 5
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