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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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