Tu ecuacion dy/dx + (1 / x) = x y , la acomodas a la forma dy/dx +(-x)y =- (1 / x) entoces haces P(x) = -x ; Q(x) = -1/x para luego resolver la lineal y' + P(x) y = Q(x).
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.