\[
\boxed{
{\frac {{\rm d}^{2}}{{\rm d}{x}^{2}}}y \left( x \right) -k{x}^{a} \left( y \left( x \right)  \right) ^{b} \left( {\frac {\rm d}{{\rm d}x}}y \left( x \right)  \right) ^{c}=0}
\]