equations

ydx = {(e^ (3x) + 1)} dy

D.E.

ydx=(e3x+1)dy

Since the equation has separable variables,

ydx=(e3x+1)dydxe3x+1dyy=0e3xdxe6x+e3xdyy=013(3xln(e3x+1))lny=C3xln(e3x+1)3lny=C

Rearranging, the answer is e3x=Cy3(e3x+1)