100-(50+20)=. 60+(10-5)= (90+10)-60=. 90-(10+60=. (80-30)+6=.94-(70+20)=.
100-(50+20)=30 60+(10-5)=65 (90+10)-60=40 90-(10+60)=20 (80-30)+6=56 94-(70+20)=4