XFM
      ---------
XWFGX ) WYEQFWQ
       -QQXFY
        =====
        EMMPXW
       -EFQWPX
        ======
         XGEGQQ
        -XXEJQF
         ======
          EJXPP

base: 10
symbols: EFGJMPQWXY
difficulty: intermediate
restrictions: no multiplication