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Simplifying -21 = 9 + 10k Solving -21 = 9 + 10k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-10k' to each side of the equation. -21 + -10k = 9 + 10k + -10k Combine like terms: 10k + -10k = 0 -21 + -10k = 9 + 0 -21 + -10k = 9 Add '21' to each side of the equation. -21 + 21 + -10k = 9 + 21 Combine like terms: -21 + 21 = 0 0 + -10k = 9 + 21 -10k = 9 + 21 Combine like terms: 9 + 21 = 30 -10k = 30 Divide each side by '-10'. k = -3 Simplifying k = -3
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