\[ x y'(x)-y(x) f\left (x^a y(x)^b\right )=0 \] ✗ Mathematica : cpu = 300.003 (sec), leaf count = 0 , timed out
$Aborted
✓ Maple : cpu = 0.128 (sec), leaf count = 39
\[ \left \{ \int _{{\it \_b}}^{y \left ( x \right ) }\!{\frac {1}{ \left ( f \left ( {x}^{a}{{\it \_a}}^{b} \right ) b+a \right ) {\it \_a}}}\,{\rm d}{\it \_a}-{\frac {\ln \left ( x \right ) }{b}}-{\it \_C1}=0 \right \} \]