The ratio \( \frac{2^{\log _{2} 1 / 4 a}-3^{\log _{27}\left(a^{2}+1\right)^{3}}-2 a}{7^{4 \log _...

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The ratio \( \frac{2^{\log _{2} 1 / 4 a}-3^{\log _{27}\left(a^{2}+1\right)^{3}}-2 a}{7^{4 \log _{49} a}-a-1} \) simplifies to
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