B412
      +---------
61429 | A23240B0
       -7A807
        =====
        B67090
       -BB35A8
        ======
         5A1A0B
        -59200B
         ======
          5B6880
         -5564A4
          ======
            A155

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