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Simplifying 3(k + -1) = 18 Reorder the terms: 3(-1 + k) = 18 (-1 * 3 + k * 3) = 18 (-3 + 3k) = 18 Solving -3 + 3k = 18 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 3k = 18 + 3 Combine like terms: -3 + 3 = 0 0 + 3k = 18 + 3 3k = 18 + 3 Combine like terms: 18 + 3 = 21 3k = 21 Divide each side by '3'. k = 7 Simplifying k = 7
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