22AA
      +---------
54643 | 45A85722
       -54643
        =====
         1A717
        -54643
         =====
         94A252
        -9A1136
         ======
          909392
         -9A1136
          ======
            71A9

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