+2=3 5+=8 +7=13
9-=5 8+=15 6+=10
-5=10 4+=11 14-=4
15-98 613-7 19-614
4+516-8 1017-9 129+4
15-410 312-8 118+3
11-2= 13-4= 16-8= 13-6=
17-9= 12-9= 11-5= 15-9=
15-8= 17-8= 13-8= 14-6=
14-9= 11-7= 16-9= 13-9=
12-6= 12-4= 12-7= 14-7=