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Simplifying 7(k + 4) = -21 Reorder the terms: 7(4 + k) = -21 (4 * 7 + k * 7) = -21 (28 + 7k) = -21 Solving 28 + 7k = -21 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + 7k = -21 + -28 Combine like terms: 28 + -28 = 0 0 + 7k = -21 + -28 7k = -21 + -28 Combine like terms: -21 + -28 = -49 7k = -49 Divide each side by '7'. k = -7 Simplifying k = -7
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