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Simplifying -3k + 3(-2k + -6) = -90 Reorder the terms: -3k + 3(-6 + -2k) = -90 -3k + (-6 * 3 + -2k * 3) = -90 -3k + (-18 + -6k) = -90 Reorder the terms: -18 + -3k + -6k = -90 Combine like terms: -3k + -6k = -9k -18 + -9k = -90 Solving -18 + -9k = -90 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + -9k = -90 + 18 Combine like terms: -18 + 18 = 0 0 + -9k = -90 + 18 -9k = -90 + 18 Combine like terms: -90 + 18 = -72 -9k = -72 Divide each side by '-9'. k = 8 Simplifying k = 8
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