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Simplifying -3(k + 13) = 12 Reorder the terms: -3(13 + k) = 12 (13 * -3 + k * -3) = 12 (-39 + -3k) = 12 Solving -39 + -3k = 12 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '39' to each side of the equation. -39 + 39 + -3k = 12 + 39 Combine like terms: -39 + 39 = 0 0 + -3k = 12 + 39 -3k = 12 + 39 Combine like terms: 12 + 39 = 51 -3k = 51 Divide each side by '-3'. k = -17 Simplifying k = -17
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