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Simplifying 3(7k + -7) = -168 Reorder the terms: 3(-7 + 7k) = -168 (-7 * 3 + 7k * 3) = -168 (-21 + 21k) = -168 Solving -21 + 21k = -168 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 + 21k = -168 + 21 Combine like terms: -21 + 21 = 0 0 + 21k = -168 + 21 21k = -168 + 21 Combine like terms: -168 + 21 = -147 21k = -147 Divide each side by '21'. k = -7 Simplifying k = -7
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