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Simplifying 3(k + 7) = 9k Reorder the terms: 3(7 + k) = 9k (7 * 3 + k * 3) = 9k (21 + 3k) = 9k Solving 21 + 3k = 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 + 3k + -9k = 9k + -9k Combine like terms: 3k + -9k = -6k 21 + -6k = 9k + -9k Combine like terms: 9k + -9k = 0 21 + -6k = 0 Add '-21' to each side of the equation. 21 + -21 + -6k = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -6k = 0 + -21 -6k = 0 + -21 Combine like terms: 0 + -21 = -21 -6k = -21 Divide each side by '-6'. k = 3.5 Simplifying k = 3.5
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