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Simplifying k + 10k + 21 = 0 Reorder the terms: 21 + k + 10k = 0 Combine like terms: k + 10k = 11k 21 + 11k = 0 Solving 21 + 11k = 0 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 + 11k = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 11k = 0 + -21 11k = 0 + -21 Combine like terms: 0 + -21 = -21 11k = -21 Divide each side by '11'. k = -1.909090909 Simplifying k = -1.909090909
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