\[ (a+b+x) y'(x)+a y(x)+x y''(x)=0 \] ✓ Mathematica : cpu = 0.0366261 (sec), leaf count = 33
\[\left \{\left \{y(x)\to e^{-x} \left (c_1 U(b,a+b,x)+c_2 L_{-b}^{a+b-1}(x)\right )\right \}\right \}\]
✓ Maple : cpu = 0.072 (sec), leaf count = 26
\[ \left \{ y \left ( x \right ) ={{\rm e}^{-x}} \left ( {{\sl M}\left (b,\,a+b,\,x\right )}{\it \_C1}+{{\sl U}\left (b,\,a+b,\,x\right )}{\it \_C2} \right ) \right \} \]