\[
\boxed{
x \left( x+3 \right) {\frac {{\rm d}^{2}}{{\rm d}{x}^{2}}}y \left( x \right) + \left( 3\,x-1 \right) {\frac {\rm d}{{\rm d}x}}y \left( x \right) +y \left( x \right) - \left( 20\,x+30 \right)  \left( {x}^{2}+3\,x \right) ^{7/3}=0}
\]