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Let Q be the foot of the perpendicular f...

Let Q be the foot of the perpendicular from the point P(7, - 2, 13) on the plane containing the lines `(x+1)/6=(y-1)/7=(z-3)/8` and `(x-1)/3=(y-2)/5=(z-3)/7`.
Then `(PQ)^2`, is equal to ____

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