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Simplifying -3k + -1(-18) = -72 Multiply -1 * -18 -3k + 18 = -72 Reorder the terms: 18 + -3k = -72 Solving 18 + -3k = -72 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 + -3k = -72 + -18 Combine like terms: 18 + -18 = 0 0 + -3k = -72 + -18 -3k = -72 + -18 Combine like terms: -72 + -18 = -90 -3k = -90 Divide each side by '-3'. k = 30 Simplifying k = 30
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