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