3-1=
19-8=
10-10+10=
8-8=
1+19=
0+12=
1+15-4=
4+7-8=
15-3-8=
13-11=
14-13-0=
12-1=
20-19+16=
15-5=
3-1=
19-8=
10-10+10=
8-8=
1+19=
0+12=
1+15-4=
4+7-8=
15-3-8=
13-11=
14-13-0=
12-1=
20-19+16=
15-5=