\[ (a+b+x) y'(x)+a y(x)+x y''(x)=0 \] ✓ Mathematica : cpu = 0.0264551 (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 = 0.183 (sec), leaf count = 26
\[\{y \left (x \right ) = \left (c_{1} \KummerM \left (b , a +b , x\right )+c_{2} \KummerU \left (b , a +b , x\right )\right ) {\mathrm e}^{-x}\}\]