Let us consider a positive charge placed at a distance x on left outside the cube of side a. The electric fields are entering the cube from left and exiting from the right. Will the flux in the cube be zero or will it have a finite value?

The electric field varies inversely with distance as E proportional to 1/r^2. Since Area is same, would the flux through the left side be greater than flux through right?

E.A=A.kq/x^2
E'.A=A.kq/(x+a)^2