Evaluate
\frac{\left(\frac{3a+b}{a+2b}\right)^{4}\left(b+29\right)}{3}
Expand
\frac{2349a^{4}+54a^{2}b^{3}+12ab^{4}+348ab^{3}+b^{5}+29b^{4}+108b^{2}a^{3}+81ba^{4}+3132ba^{3}+1566\left(ab\right)^{2}}{3\left(a+2b\right)^{4}}
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