739C
      +---------
83475 | 2095DD62
       -D36BE
        =====
        83C49D
       -8446C2
        ======
         826606
        -864350
         ======
           52C52
          -23731
           =====
            5AED

base: 15
letters: 0123456789ABCDE
difficulty: medium
missing: A