7+2= 9-4= 6+7= 8+4= 5+4=
10-3= 4+6= 9+8= 8+5= 9+3=
13-10= 14-4= 4+7= 6+10= 10-2=
5+9= 7+6= 9-9= 10-6= 6+5=
4+4+5= 16-6-2= 10-4+2=
8+2+7= 17-10-3= 8+8-10=