\[ a b x+a y'(x)^2+b y(x)+y'(x)^3=0 \] ✓ Mathematica : cpu = 0.615321 (sec), leaf count = 398
\[\text {Solve}\left [\left \{x=-\frac {-a \left (\frac {\sqrt [3]{2} a^2}{3 \sqrt [3]{\sqrt {\left (-2 a^3-27 a b x-27 b y(x)\right )^2-4 a^6}-2 a^3-27 a b x-27 b y(x)}}+\frac {\sqrt [3]{\sqrt {\left (-2 a^3-27 a b x-27 b y(x)\right )^2-4 a^6}-2 a^3-27 a b x-27 b y(x)}}{3 \sqrt [3]{2}}-\frac {a}{3}\right )+\frac {3}{2} \left (\frac {\sqrt [3]{2} a^2}{3 \sqrt [3]{\sqrt {\left (-2 a^3-27 a b x-27 b y(x)\right )^2-4 a^6}-2 a^3-27 a b x-27 b y(x)}}+\frac {\sqrt [3]{\sqrt {\left (-2 a^3-27 a b x-27 b y(x)\right )^2-4 a^6}-2 a^3-27 a b x-27 b y(x)}}{3 \sqrt [3]{2}}-\frac {a}{3}\right )^2+a^2 \log \left (\frac {\sqrt [3]{2} a^2}{3 \sqrt [3]{\sqrt {\left (-2 a^3-27 a b x-27 b y(x)\right )^2-4 a^6}-2 a^3-27 a b x-27 b y(x)}}+\frac {\sqrt [3]{\sqrt {\left (-2 a^3-27 a b x-27 b y(x)\right )^2-4 a^6}-2 a^3-27 a b x-27 b y(x)}}{3 \sqrt [3]{2}}+\frac {2 a}{3}\right )}{b}+c_1\right \},y(x)\right ]\] ✓ Maple : cpu = 0.334 (sec), leaf count = 86
\[ \left \{ y \left ( x \right ) =-ax-{\frac { \left ( {{\rm e}^{{\it RootOf} \left ( -2\,{a}^{2}{\it \_Z}-3\,{{\rm e}^{2\,{\it \_Z}}}+8\,a{{\rm e}^{{\it \_Z}}}+2\,{\it \_C1}\,b-5\,{a}^{2}-2\,bx \right ) }}-a \right ) ^{2}{{\rm e}^{{\it RootOf} \left ( -2\,{a}^{2}{\it \_Z}-3\,{{\rm e}^{2\,{\it \_Z}}}+8\,a{{\rm e}^{{\it \_Z}}}+2\,{\it \_C1}\,b-5\,{a}^{2}-2\,bx \right ) }}}{b}} \right \} \]