9923
      +---------
A3763 | 43431A75
       -A3763
        =====
        908AAA
       - A3763
        ======
         712247
        -65460A
         ======
          AA6AA5
         -A673A9
          ======
           25404

base: 11
letters: 0123456789A
difficulty: intermediate
restrictions: no multiplication