\[ y''(x)=\frac {(a+b) y'(x)}{x^2}-\frac {y(x) (x (a+b)+a b)}{x^4} \] ✓ Mathematica : cpu = 0.0824159 (sec), leaf count = 37
\[\left \{\left \{y(x)\to \frac {c_2 x e^{-\frac {a}{x}}}{a-b}+c_1 x e^{-\frac {b}{x}}\right \}\right \}\] ✓ Maple : cpu = 0.117 (sec), leaf count = 25
\[ \left \{ y \left ( x \right ) =x \left ( {{\rm e}^{-{\frac {a}{x}}}}{\it \_C1}+{{\rm e}^{-{\frac {b}{x}}}}{\it \_C2} \right ) \right \} \]