6-5= 2+5= 4+2= 1+5= 2+( )=6
4+1= 7-7= 5-4= 6+1= 7-( )=3
7-5= 6-4= 4-0= 7-3= 3+( )=6
3+2= 6-3= 5+2= 3-3= 5-( )=2
4+3= 4+1= 7-2= 7-6=( )-( )=( )