Let \( y=\frac{2^{\log _{2^{1 / 4}} x}-3^{\log _{27}\left(x^{2}+1\r...

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Let \( y=\frac{2^{\log _{2^{1 / 4}} x}-3^{\log _{27}\left(x^{2}+1\right)^{3}}-2 x}{7^{4 \log _{49} x}-x-1} \) and \( \frac{d y}{d x}=a x+b \), then
\( \mathrm{W} \) the value of \( a+b \) is
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