20-8=
4+10=
7+2=
9-5=
20-14=
17-3=
5+6=
1+2=
4+12=
3+1=
9+7=
12-5=
3+11=
1+8=
4+12=
6-3=
14-13=
9+6=
17-3=
10+3=
19-11=
19-1=
10-7=
20-4=
10+2=
7+12=
15-11=
16-12=
8+3=
18-16=
3+15=
19-15=
9+7=
11-10=
13-2=
15-11=
4+10=
7+2=
9-5=
20-14=
17-3=
5+6=
1+2=
4+12=
3+1=
9+7=
12-5=
3+11=
1+8=
4+12=
6-3=
14-13=
9+6=
17-3=
10+3=
19-11=
19-1=
10-7=
20-4=
10+2=
7+12=
15-11=
16-12=
8+3=
18-16=
3+15=
19-15=
9+7=
11-10=
13-2=
15-11=