\[
\boxed{
{\frac {\rm d}{{\rm d}x}}y \left( x \right) =1/16\,{\frac {-8\,{x}^{2} \left( y \left( x \right)  \right) ^{3}+16\,x \left( y \left( x \right)  \right) ^{2}+16\,x \left( y \left( x \right)  \right) ^{3}-8+12\,xy \left( x \right) -6\,{x}^{2} \left( y \left( x \right)  \right) ^{2}+{x}^{3} \left( y \left( x \right)  \right) ^{3}}{ \left( -2+xy \left( x \right) -2\,y \left( x \right)  \right) x}}=0}
\]