\[
\boxed{
 \left( 3\,x+1 \right)  \left( {\frac {\rm d}{{\rm d}x}}y \left( x \right)  \right) ^{2}-3\, \left( y \left( x \right) +2 \right) {\frac {\rm d}{{\rm d}x}}y \left( x \right) +9=0}
\]