B683
      +---------
1B8A2 | A8A180A3
       -1B8A2
        =====
        B69360
       -B19794
        ======
         27493A
        -B03162
         ======
          236523
         -246904
          ======
            306B

base: 12
letters: 0123456789AB
difficulty: intermediate
restrictions: no multiplication