\[ y'(x)=\frac {a^3 x^3+3 a^2 b x^2 y(x)+a^2 b x^2+3 a b^2 x y(x)^2+2 a b^2 x y(x)+b^3 y(x)^3+b^3 y(x)^2+b^3}{b^3} \] ✓ Mathematica : cpu = 0.343324 (sec), leaf count = 145
\[\text {Solve}\left [-\frac {1}{3} (27 a+29 b)^{2/3} \text {RootSum}\left [\text {$\#$1}^3 (27 a+29 b)^{2/3}-3 \text {$\#$1} b^{2/3}+(27 a+29 b)^{2/3}\& ,\frac {\log \left (\frac {\frac {3 a x+b}{b}+3 y(x)}{\sqrt [3]{\frac {27 a+29 b}{b}}}-\text {$\#$1}\right )}{b^{2/3}-\text {$\#$1}^2 (27 a+29 b)^{2/3}}\& \right ]=\frac {1}{9} x \left (\frac {27 a+29 b}{b}\right )^{2/3}+c_1,y(x)\right ]\] ✓ Maple : cpu = 0.046 (sec), leaf count = 42
\[ \left \{ y \left ( x \right ) ={\frac {{\it RootOf} \left ( \int ^{{\it \_Z}}\! \left ( {{\it \_a}}^{3}b+{{\it \_a}}^{2}b+a+b \right ) ^{-1}{d{\it \_a}}b-x+{\it \_C1} \right ) b-ax}{b}} \right \} \]