\[ 2 a y'(x)+f(x) y(x)+y''(x)=0 \] ✗ Mathematica : cpu = 0.372802 (sec), leaf count = 0 , could not solve
DSolve[f[x]*y[x] + 2*a*Derivative[1][y][x] + Derivative[2][y][x] == 0, y[x], x]
✗ Maple : cpu = 0. (sec), leaf count = 0 , result contains DESol
\[\{y \left (x \right ) = \mathit {DESol}\left (\left \{2 a \left (\frac {d}{d x}\textit {\_Y} \left (x \right )\right )+\textit {\_Y} \left (x \right ) f \left (x \right )+\frac {d^{2}}{d x^{2}}\textit {\_Y} \left (x \right )\right \}, \left \{\textit {\_Y} \left (x \right )\right \}\right )\}\]