CC5
      +--------
7EA69 | D05A349
       -D531A
        =====
         D9164
        -D531A
         =====
          C57D9
         -BC483
          =====
           1896

base: 15
letters: 0123456789ABCDE
difficulty: challenging
hints: A << 1, 3 << A, 9 << 6
missing: 2