WJPR
      +---------
GTGXT | TJCXRXTH
       -CTCRT
        =====
        GGRJCX
       -GHXGTT
        ======
         GWTRGT
        -GNGWNH
         ======
          GCTRTH
         -GWXCPT
          ======
            RCXT

base: 10
letters: CGHJNPRTWX
difficulty: medium
restrictions: no multiplication