9-5= 7+6= 13-2= 11-3=
7+7= 9-8= 5+7= 12-3-6=
8-2= 3+3= 9-2= 9+1-4=
15-8= 17-9= 14-4= 16-7=
7+=14 15-=10 +=20
2019 17-107 4+97+7 16-49+2
011 10+66 5+77-5 7+88+7