48C4
      +---------
7871C | 53741137
       -7871C
        =====
        01DBA1
       -0202D9
        ======
         E63613
        -EAE652
         ======
           6DCC7
          -7871C
           =====
           7B828

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