dsolve(diff(y(x),x)=f(x,y(x)),y(x)); outputs: Error, (in ODEtools/info/dy/dx=f(x)) unable to handle composite functions containing, y(x), or , diff(y(x),x), as in, abs(x-y(x))
But, we can solve this by hand since it is homogeneous - try this!
Great otherwise!