\[
\boxed{
8\,x \left( {\frac {\rm d}{{\rm d}x}}y \left( x \right)  \right) ^{3}-12\,y \left( x \right)  \left( {\frac {\rm d}{{\rm d}x}}y \left( x \right)  \right) ^{2}+9\,y \left( x \right) =0}
\]