57+3= 50+34= 9+61= 87-50= 81-20-6=
70-7= 3+56= 17-8= 23-6= 28-8+9=
13-6= 12-7= 62+30= 86-40= 4+26-8=
4+59= 38+5= 45+6= 24+8= 47-30+6=