YXGYN
     +---------
YJNL | TRTXUYJR
      -YJNL
       ====
        GJMU
       -LLXR
        ====
         NLUY
        -NJYR
         ====
          TGYJ
         -YJNL
          ====
          YTTNR
         -YYRNR
          =====
           YTRR

base: 10
letters: GJLMNRTUXY
difficulty: intermediate
restrictions: no multiplication