just trying
the given expression can be written as

d(dy)=x(e^-2x)dx
dy=int((x)(e^-2x)dx
by applying by parts
dy=x(e^-2x/-2)-(e^-2x/-2)
y=int(x(e^-2x/-2)+(e^-2x/2))
y=int(x)(e^-2x/-2)+int(e^-2x/2)
in 1st int apply by parts and sec simple int to get general soln
y=x(e^-2x/-2)-(e^-2x/-2)+e^-2x/-4)