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Let ABC be a triangle and A -= (1,2) ,y ...

Let ABC be a triangle and `A -= (1,2) ,y = x ` be the perpendicular bisector of AB and `x-2y+1=0` be the perpendicular bisector of `angle C` . If the equation of BC is given by `ax+by-5 = 0` then the value of `a -2b` is

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