Find a function F(x,y) whose level curves are solutions to the differential equation $$( x^2 - 4xy )dx + x dy= 0$$
I am confused on how to solve this. The idea is to the use exact form to solve it but they don't come out to be exact. I got that
$$M = x^2 - 4xy$$ $$N = x$$
Taking the partial derivative of both does not come out to be exact. What else can I do to solve this?