15
10
7
( )?
18+5=
64-7=
68-60=
11-8=
3+40
35-20=
80-60=
35+7=
52+8=
39+20=
70-5=
62-8=
50+15=
65-20=
48-9=
12-3=
14-7=
8+4=
30+7=
42-2=
50+6=
20-9=
55-50=
36-6=
63-3=
25-5=
77-70=
7+9-8=
64-60+8=
17-9-2=