16-8= 0+8= 70-50= 12+70= 60+20+4=
80-5= 30+39= 54-6= 27+9= 66-(33+7)=
44+6= 60+30= 36+50= 79-60= 7+(73-70)=
44-6= 60+4= 36-5= 79-9= 7+7+7=