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Simplifying 3(k + 7) = 15 Reorder the terms: 3(7 + k) = 15 (7 * 3 + k * 3) = 15 (21 + 3k) = 15 Solving 21 + 3k = 15 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 3k = 15 + -21 Combine like terms: 21 + -21 = 0 0 + 3k = 15 + -21 3k = 15 + -21 Combine like terms: 15 + -21 = -6 3k = -6 Divide each side by '3'. k = -2 Simplifying k = -2
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