4+5= 7+2= 8+4= 7+7=
7-3= 8-6= 8-8= 11-1=
9-7= 6-5= 5-3= 9-8=
4+0= 9+5= 14-10= 2+9=
3+8= 8+7= 10-2= 10+6=