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Simplifying 15 = -21 + 9k Solving 15 = -21 + 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. 15 + -9k = -21 + 9k + -9k Combine like terms: 9k + -9k = 0 15 + -9k = -21 + 0 15 + -9k = -21 Add '-15' to each side of the equation. 15 + -15 + -9k = -21 + -15 Combine like terms: 15 + -15 = 0 0 + -9k = -21 + -15 -9k = -21 + -15 Combine like terms: -21 + -15 = -36 -9k = -36 Divide each side by '-9'. k = 4 Simplifying k = 4
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