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