Suppose a , b , c are such that the curv...

Suppose `a , b , c` are such that the curve `y=a x^2+b x+c` is tangent to `y=3x-3a t(1,0)` and is also tangent to `y=x+1a t(3,4)dot` Then the value of `(2a-b-4c)` equals ______

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