\[ y'(x)=\frac {9 x^4 y(x)+27 x^2 y(x)^2+x^6-6 x^3-18 x y(x)+27 y(x)^3-18 x}{9 x^2+27 y(x)+27} \] ✓ Mathematica : cpu = 0.161262 (sec), leaf count = 75
\[\left \{\left \{y(x)\to \frac {1}{3} \left (-x^2-3\right )+\frac {1}{27 \left (\frac {1}{27}-\frac {1}{\sqrt {-1458 x+c_1}}\right )}\right \},\left \{y(x)\to \frac {1}{3} \left (-x^2-3\right )+\frac {1}{27 \left (\frac {1}{27}+\frac {1}{\sqrt {-1458 x+c_1}}\right )}\right \}\right \}\] ✓ Maple : cpu = 0.118 (sec), leaf count = 77
\[ \left \{ y \left ( x \right ) ={\frac {1}{-6\,x+6\,{\it \_C1}} \left ( -2\,{\it \_C1}\,{x}^{2}+2\,{x}^{3}-3\,\sqrt {2\,{\it \_C1}-2\,x+1}+3 \right ) },y \left ( x \right ) ={\frac {1}{-6\,x+6\,{\it \_C1}} \left ( -2\,{\it \_C1}\,{x}^{2}+2\,{x}^{3}+3\,\sqrt {2\,{\it \_C1}-2\,x+1}+3 \right ) } \right \} \]