If f(x)=f(2a-x). Then its graph is symmetrical about which line?

The graph of f(x)=f(-x) is symmetric about x=0. Similarly f(x)=f(x)=f(-(x-2a)). in this question f(x) is symmetric about the line perpendicular to the x axis which passes in between x=x and x=2a .Therefore the coordinate about which this function`s graph is symmetrial is x=a