\[ (2 x+1) y'(x)-4 e^{-y(x)}+2=0 \] ✓ Mathematica : cpu = 0.0178772 (sec), leaf count = 20
\[\left \{\left \{y(x)\to \log \left (\frac {e^{c_1}}{2 x+1}+2\right )\right \}\right \}\]
✓ Maple : cpu = 0.218 (sec), leaf count = 31
\[ \left \{ y \left ( x \right ) =-\ln \left ( {\frac {2\,x+1}{-1+ \left ( 4\,x+2 \right ) {{\rm e}^{2\,{\it \_C1}}}}} \right ) -2\,{\it \_C1} \right \} \]