8+=13 36=30+ 9+=12
78=70+ 40=49- 78=70+
13-7= 5+7= 12-9= 8+6=
8+9= 11-6= 17-5= 13+4=
6+8= 15-6= 12-5= 9+4=
15-8= 11-2= 16-5= 17-9=
13+4= 6+8= 15-9= 16-7=
13-9= 16-8= 10+3= 14-8=
12-7 = 15-6 = 8+4 = 14-6=
13-7= 15-9= 9+9= 17-9=