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Simplifying 18 + -3k + 9 = 15 Reorder the terms: 18 + 9 + -3k = 15 Combine like terms: 18 + 9 = 27 27 + -3k = 15 Solving 27 + -3k = 15 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-27' to each side of the equation. 27 + -27 + -3k = 15 + -27 Combine like terms: 27 + -27 = 0 0 + -3k = 15 + -27 -3k = 15 + -27 Combine like terms: 15 + -27 = -12 -3k = -12 Divide each side by '-3'. k = 4 Simplifying k = 4
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