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Simplifying 21 = 3 + -9k Solving 21 = 3 + -9k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '9k' to each side of the equation. 21 + 9k = 3 + -9k + 9k Combine like terms: -9k + 9k = 0 21 + 9k = 3 + 0 21 + 9k = 3 Add '-21' to each side of the equation. 21 + -21 + 9k = 3 + -21 Combine like terms: 21 + -21 = 0 0 + 9k = 3 + -21 9k = 3 + -21 Combine like terms: 3 + -21 = -18 9k = -18 Divide each side by '9'. k = -2 Simplifying k = -2
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