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$$A(2, 6, 2), B(-4, 0, \lambda), C(2, 3, -1)$$ and $$D(4, 5, 0)$$, $$\lambda \leq 5$$ are the vertices of a quadrilateral $$ABCD$$. If its area is 18 square units, then $$5 - 6\lambda$$ is equal to _____.
Correct Answer: 11
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