82A9
      +---------
44068 | 5839BAA5
       -44068
        =====
        8906CA
       -81C1C2
        ======
          18C0A
         -7231A
          =====
          A22CB5
         -A79979
          ======
            9870

base: 13
letters: 0123456789ABC
difficulty: intermediate
restrictions: no multiplication