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Let y=(2^((log)2 1/4x)-3^((log)(27) (x...

Let `y=(2^((log)_2 1/4x)-3^((log)_(27) (x^2+1)^3-2x))/(7^(4(log)_(49)x)-x-1)a n d(dy)/(dx)=a x+b ,` then the value of `a+b` is_______.

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