8+=15 4+= 12 +6 = 13
16-=7 -5 = 8 13-= 9
16-9= 5+8= 11-4= 10+9= 15-7=
17-8= 4+9= 15-6= 12-5= 14-6=
86 68 5050 10099
9+918-8 6 12-6 14 -84
195+4 15-69 13-715-9