(237+118)-37=(237-37)+118=200+118=318
(439+526)-326=(526-326)+439=200+439=639
729-(513+129)=(729-129)-513=600-513=87
637-(337+256)=(637-337)-256=300-256=44
(148+245)-45=(245-45)+148=200+148=348
(473+132)-173=(473-173)+132=432
843-(154+243)=(843-243)-154=600-154=446
894-(394+148)=(894-394)-148=500-148=352