15-0=

17-7=

19-12=

6+14=

12+7=

11+8=

14-3=

5+14=

12+6=

8+12=

17-0=

16+1=

15-12=

19-5=

15+4=

11-7=

14-6=

13+2=

11-7=

18-16=

13+2=

11-1=

16-16=

3+17=

15+5=

12+5=

10+1=

11-0=

4+12=

8+10=

13-2=

11-6=

12-1=

9+8=

13-9=

11+2=

19-14=

10+2=

5+7=

14+4=

20-13=

11+4=

12-5=

3+13=

19-19=

20-11=

10+5=

14-12=

5+12=

12-0=