\[
\boxed{
 \left( 3\,x+5 \right)  \left( {\frac {\rm d}{{\rm d}x}}y \left( x \right)  \right) ^{2}- \left( 3\,y \left( x \right) +x \right) {\frac {\rm d}{{\rm d}x}}y \left( x \right) +y \left( x \right) =0}
\]