\[
\boxed{
{\frac {{\rm d}^{2}}{{\rm d}{x}^{2}}}y \left( x \right) =2\,{\frac { \left( ax+2\,b \right) {\frac {\rm d}{{\rm d}x}}y \left( x \right) }{x \left( ax+b \right) }}-{\frac { \left( 2\,ax+6\,b \right) y \left( x \right) }{ \left( ax+b \right) {x}^{2}}}=0}
\]