\[ \boxed { x{\frac {\rm d}{{\rm d}x}}y \left ( x \right ) -y \left ( x \right ) f \left ( {x}^{a} \left ( y \left ( x \right ) \right ) ^{b} \right ) =0} \]
Mathematica: cpu = 0 (sec), leaf count = 0 \[ \text {Hanged} \]
Maple: cpu = 0.078 (sec), leaf count = 39 \[ \left \{ \int _{{\it \_b}}^{y \left ( x \right ) }\!{\frac {1}{{\it \_a} \, \left ( f \left ( {x}^{a}{{\it \_a}}^{b} \right ) b+a \right ) }} \,{\rm d}{\it \_a}-{\frac {\ln \left ( x \right ) }{b}}-{\it \_C1}=0 \right \} \]