11-6=
15-9=
13-9=
11-3=
13-7=
16-8=
14-9+8=
17-8-4=
14-7+4=
14-8-3=
10+4-8=
17-9+7=
11-6+9=
14-7+3=
17-8+2=
12+4-8=
8+7-6=
11+6-8=
15-6+3=
13+2-9=
12-7= 14-6= 8+5= 11-4= 18-9=
4+9= 16-7= 14-7= 13-6= 15-8=
11-5= 9+5= 11-2= 16-9= 13-4=
13-6= 12-6= 15-9= 11-4=
13-7= 18-9= 15-7= 8+5=