\[ a y(x)+(b+x) y'(x)+x y''(x)=0 \] ✓ Mathematica : cpu = 0.033487 (sec), leaf count = 36
\[\left \{\left \{y(x)\to e^{-x} \left (c_1 U(b-a,b,x)+c_2 L_{a-b}^{b-1}(x)\right )\right \}\right \}\]
✓ Maple : cpu = 0.089 (sec), leaf count = 30
\[ \left \{ y \left ( x \right ) ={{\rm e}^{-x}} \left ( {{\sl M}\left (-a+b,\,b,\,x\right )}{\it \_C1}+{{\sl U}\left (-a+b,\,b,\,x\right )}{\it \_C2} \right ) \right \} \]