????????
      +---------
47915 | 269129A2
       -47915
        =====
         A6649
        -47915
         =====
         52135A
        -592B62
         ======
          927552
         -959747
          ======
          ??????

base: 12
letters: 0123456789AB
missing: 8 0
difficulty: intermediate
hints: 8 << 1