Denote by Re(z) and Im(z) the real part and imaginary part, respectively, of a complex number z; that is, if z=a+bi, then Re(z)=a and Im(z)=b. Suppose that there exists some real number k such that Im(w1)=Im(w2k)=Im(w3k) for some complex number w with ∣∣w∣∣=23 , Re(w)>0, and Im(w)=0. If k can be expressed as ca−b for integers a, b, c with a squarefree, find a+b+c.