\[ (a+b+x) y'(x)+a y(x)+x y''(x)=0 \] ✓ Mathematica : cpu = 0.0276616 (sec), leaf count = 37
\[\left \{\left \{y(x)\to c_1 e^{-x} U(b,a+b,x)+c_2 e^{-x} L_{-b}^{a+b-1}(x)\right \}\right \}\] ✓ Maple : cpu = 0.31 (sec), leaf count = 26
\[ \left \{ y \left ( x \right ) ={{\rm e}^{-x}} \left ( {{\sl M}\left (b,\,a+b,\,x\right )}{\it \_C1}+{{\sl U}\left (b,\,a+b,\,x\right )}{\it \_C2} \right ) \right \} \]