BB0B
      +---------
8B960 | 12B91705
       -98204
        =====
        7B4787
       - 98204
        ======
         6A6550
        -317040
         ======
          7B97A5
         - 98204
          ======
           66637

base: 12
letters: 0123456789AB
difficulty: medium
restrictions: no multiplication