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Simplifying 6k + 21 + 4k = -90 Reorder the terms: 21 + 6k + 4k = -90 Combine like terms: 6k + 4k = 10k 21 + 10k = -90 Solving 21 + 10k = -90 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 10k = -90 + -21 Combine like terms: 21 + -21 = 0 0 + 10k = -90 + -21 10k = -90 + -21 Combine like terms: -90 + -21 = -111 10k = -111 Divide each side by '10'. k = -11.1 Simplifying k = -11.1
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