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Let `P(x_(0),y_(0))` be a point on the curve `C : (x^(2)-11)(y+1)+4 =0 where x_(0), y_(0) in N`. If area of the triangle formed by the normal drawn to the curve 'C' at P and the coordinate axes is (a/b), `a b in N` then find the least value of (a-6b)

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