\[ 3 a y(x)^3+6 a x y(x)^2+y'(x)=0 \] ✓ Mathematica : cpu = 0.438838 (sec), leaf count = 185
\[\text {Solve}\left [\frac {\sqrt [3]{-3} \sqrt [3]{a} x \text {Ai}\left ((-3)^{2/3} a^{2/3} x^2-\frac {(-1)^{2/3}}{\sqrt [3]{3} \sqrt [3]{a} y(x)}\right )+\text {Ai}'\left ((-3)^{2/3} a^{2/3} x^2-\frac {(-1)^{2/3}}{\sqrt [3]{3} \sqrt [3]{a} y(x)}\right )}{\sqrt [3]{-3} \sqrt [3]{a} x \text {Bi}\left ((-3)^{2/3} a^{2/3} x^2-\frac {(-1)^{2/3}}{\sqrt [3]{3} \sqrt [3]{a} y(x)}\right )+\text {Bi}'\left ((-3)^{2/3} a^{2/3} x^2-\frac {(-1)^{2/3}}{\sqrt [3]{3} \sqrt [3]{a} y(x)}\right )}+c_1=0,y(x)\right ]\] ✓ Maple : cpu = 0.061 (sec), leaf count = 48
\[y \relax (x ) = \frac {1}{3 a \,x^{2}+\RootOf \left (\AiryBi \left (\textit {\_Z} \right ) \left (-3 a \right )^{\frac {1}{3}} c_{1} x +\left (-3 a \right )^{\frac {1}{3}} x \AiryAi \left (\textit {\_Z} \right )+\AiryBi \left (1, \textit {\_Z}\right ) c_{1}+\AiryAi \left (1, \textit {\_Z}\right )\right ) \left (-3 a \right )^{\frac {1}{3}}}\]