Archeologists use coordinate grids on their dig sites to help document where objects are found. While excavating the site of a large ancient building, archeologists find what they
believe to be a wooden support beam that extended across the entire building. One end of
the beam was located at the coordinate (-13, 12) and markings on the beam indicate that
the midpoint of the beam was located at (2,4). Assuming the beam is still intact, where
should the archeologists begin digging to find the other end of the beam?