\[ 4 x^3 y'(x)-4 x^2 y(x)+9 y(x) y'(x)^2=0 \] ✓ Mathematica : cpu = 0.234458 (sec), leaf count = 143
\[\left \{\text {Solve}\left [\frac {1}{2} \log (y(x))-\frac {\sqrt {9 x^2 y(x)^2+x^6} \tanh ^{-1}\left (\frac {x^2}{\sqrt {x^4+9 y(x)^2}}\right )}{2 x \sqrt {x^4+9 y(x)^2}}=c_1,y(x)\right ],\text {Solve}\left [\frac {\sqrt {9 x^2 y(x)^2+x^6} \tanh ^{-1}\left (\frac {x^2}{\sqrt {x^4+9 y(x)^2}}\right )}{2 x \sqrt {x^4+9 y(x)^2}}+\frac {1}{2} \log (y(x))=c_1,y(x)\right ]\right \}\] ✓ Maple : cpu = 0.666 (sec), leaf count = 87
\[ \left \{ y \left ( x \right ) =-{\frac {i}{3}}{x}^{2},y \left ( x \right ) ={\frac {i}{3}}{x}^{2},y \left ( x \right ) =-{\frac {1}{6}\sqrt {-4\,{\it \_C1}\,{x}^{2}+{{\it \_C1}}^{2}}},y \left ( x \right ) ={\frac {1}{6}\sqrt {-4\,{\it \_C1}\,{x}^{2}+{{\it \_C1}}^{2}}},y \left ( x \right ) =-2\,{\frac {\sqrt {{\it \_C1}\,{x}^{2}+9}}{{\it \_C1}}},y \left ( x \right ) =2\,{\frac {\sqrt {{\it \_C1}\,{x}^{2}+9}}{{\it \_C1}}} \right \} \]