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The intersection of the planes 2 x-y-3 z...

The intersection of the planes `2 x-y-3 z=8` and `x+2 y-4 z=14` is the line `L`. The value of ` a` ' for which the line `L` is perpendicular to the line through `(a, 2,2)` and `(6,11,-1` is

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