\[ y(x) (l+P(x))+y''(x)=0 \] ✗ Mathematica : cpu = 0.197984 (sec), leaf count = 0 , could not solve
DSolve[(l + P[x])*y[x] + Derivative[2][y][x] == 0, y[x], x]
✗ Maple : cpu = 0. (sec), leaf count = 0 , result contains DESol
\[\{y \left (x \right ) = \mathit {DESol}\left (\left \{\left (l +P \left (x \right )\right ) \textit {\_Y} \left (x \right )+\frac {d^{2}}{d x^{2}}\textit {\_Y} \left (x \right )\right \}, \left \{\textit {\_Y} \left (x \right )\right \}\right )\}\]