13-□=□
11﹣4=
12﹣3=
14﹣6=
17﹣8=
13﹣5=
13﹣7=
12﹣6=
11﹣2=
16﹣8=
13﹣4=
11-=5 12-=8 -6=6
14-=5 +8=17 15-6=
15-76 14- 85 14-9 12-6
13-86 11-75 11-317-8
12-67 17-9 8 15-84+2
11-=6 12-=8 14-=7