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Simplifying 21 = 9 + -2k Solving 21 = 9 + -2k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '2k' to each side of the equation. 21 + 2k = 9 + -2k + 2k Combine like terms: -2k + 2k = 0 21 + 2k = 9 + 0 21 + 2k = 9 Add '-21' to each side of the equation. 21 + -21 + 2k = 9 + -21 Combine like terms: 21 + -21 = 0 0 + 2k = 9 + -21 2k = 9 + -21 Combine like terms: 9 + -21 = -12 2k = -12 Divide each side by '2'. k = -6 Simplifying k = -6
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