DD62
      +---------
DAEBB | 38123D9A
       -89DCB
        =====
         39B6D
        -89DCB
         =====
         206589
        - A4510
         ======
           70C9A
          -DAEBB
           =====
           D2DE7

base: 16
letters: 0123456789ABCDEF
difficulty: hard
missing: F