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