\[ y''(x)=\frac {(a+b) y'(x)}{x^2}-\frac {y(x) (x (a+b)+a b)}{x^4} \] ✓ Mathematica : cpu = 0.0931848 (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 = 0.046 (sec), leaf count = 25
\[\left \{y \left (x \right ) = \left (c_{1} {\mathrm e}^{-\frac {a}{x}}+c_{2} {\mathrm e}^{-\frac {b}{x}}\right ) x\right \}\]