\[ y''(x)=\frac {2 (a x+2 b) y'(x)}{x (a x+b)}-\frac {y(x) (2 a x+6 b)}{x^2 (a x+b)} \] ✓ Mathematica : cpu = 0.0378845 (sec), leaf count = 23
\[\left \{\left \{y(x)\to \frac {x^2 \left (c_2 x+c_1\right )}{a x+b}\right \}\right \}\]
✓ Maple : cpu = 0.041 (sec), leaf count = 20
\[ \left \{ y \left ( x \right ) ={\frac {{x}^{2} \left ( {\it \_C2}\,x+{\it \_C1} \right ) }{ax+b}} \right \} \]