HRRR
      +---------
HRTGL | ATYGLLRT
       -HRTGL
        =====
        HETYYL
       -HXRTGE
        ======
         HEXLER
        -HXRTGE
         ======
          HTECLT
         -HXRTGE
          ======
            RAXC

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