12-6= 11-4= 14-9=
11-6= 17-6= 8-5=
13-5=
6+10=
12-6=
11-3=
17-9=
12-8=
6+8=
9+6=
10-4=
4+8=
6+=11 4+=13 3+=11
11-4= 15-6= 14-5=
12-45 15-78 13-48
12-64 718-9 413-3