10B1
      +---------
77AEA | 7936C52F
       -77AEA
        =====
         4C115
        -EEF75
         =====
         1B0282
        -1F2F64
         ======
           A136F
          -77AEA
           =====
           12C13

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