Answer
$$
(2 x+4 y)+(2 x-2 y) y^{\prime}=0
$$
The given equation is not exact.
Work Step by Step
$$
(2 x+4 y)+(2 x-2 y) y^{\prime}=0
$$
this equation can be written in the differential form
$$
M(x,y) d x+N(x,y) d y=0
$$
Therefore
$$
(2 x+4 y) d x+(2 x-2 y) d y=0
$$
By calculating $M_{y}$ and $N_{x}$ , we find that
$$
\begin{aligned} M_{y}(x, y) &=4
\\ N_{x}(x, y) & =2 \end{aligned}
$$
we obtain that
$$
M_{y}(x, y) \neq N_{x}(x, y)
$$
so the given equation is not exact.