9148
      +---------
60A64 | A66996A5
       -60A64
        =====
        235336
       -222713
        ======
         16629A
        -118C47
         ======
          B9B855
         -2AB479
          ======
           17ACA

base: 13
letters: 0123456789ABC
difficulty: medium
restrictions: no multiplication