E175
      +---------
C7FD5 | 34501309
       -36830
        =====
         40043
        -D0137
         =====
         C68AC0
        -1BFF50
         ======
          CE9869
         -CE9E5E
          ======
              18

base: 16
letters: 0123456789ABCDEF
difficulty: hard
missing: 2