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Let two parallel lines L1 and L2 with po...

Let two parallel lines `L_1` and `L_2` with positive slope are tangent to the circle `C_1` : `x^2 + y^2 -2x 16y + 64 = 0`. If `L_1` is also tangent to the circle `C_2` : `x^2 + y^2 - 2x + 2y -2 = 0` and the equation of `L_2` is `asqrta x - by + c - a sqrta = 0` where a,b,c in N. then find the value of `(a+b+c)/7`

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