\[
\boxed{
{\frac {\rm d}{{\rm d}x}}y \left( x \right) =-2/3\,x+1+ \left( y \left( x \right)  \right) ^{2}+2/3\,{x}^{2}y \left( x \right) +1/9\,{x}^{4}+ \left( y \left( x \right)  \right) ^{3}+{x}^{2} \left( y \left( x \right)  \right) ^{2}+1/3\,y \left( x \right) {x}^{4}+1/27\,{x}^{6}=0}
\]