7CA2
      +---------
B45C0 | A049D986
       -B45C0
        =====
        BD2D59
       -BA9D06
        ======
         7EC338
        -745560
         ======
          76D8E6
         -7AAC41
          ======
           B7B76

base: 15
letters: 0123456789ABCDE
difficulty: medium