13398
     +---------
5178 | 64549836
      -9471
       ====
       87599
      - 4573
       =====
        87958
       - 4573
        =====
         83863
        -81279
         =====
           1926
          -5178
           ====
           8129

base: 10
letters: 0123456789
difficulty: medium
restrictions: no multiplication
missing: 0