733C
      +---------
76178 | 723C77B6
       -76178
        =====
         34407
        -3703B
         =====
          35C4B
         -3703B
          =====
           CB366
          -C8754
           =====
            8640

base: 13
letters: 0123456789ABC
difficulty: intermediate
restrictions: no multiplication
missing: 9 A