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