????????
      +---------
EA936 | E29C23C7
       -EA936
        =====
         C4863
        -C1DD2
         =====
          9B79C
         -C1DD2
          =====
          E96157
         -EC293D
          ======
          ??????

base: 15
letters: 0123456789ABCDE
difficulty: hard
hints: 9 << 1, 6 << D, C != 0
missing: 0