15-(     )-9=2

14-0-(     )=7

13-2-(     )=4

(     )-11-1=2

(     )-15-1=4

(     )-0-7=4

(     )-10-0=6

20-(     )-0=12

(     )-5-7=0

(     )-15-4=1

19-12-(     )=3

19-(     )-6=13

12-5-(     )=2

(     )-11-8=1

11-(     )-4=1

(     )-6-6=1

17-(     )-6=8

(     )-17-0=3

(     )-0-13=4

13-12-(     )=1

20-0-(     )=12

19-9-(     )=7

(     )-6-7=1

13-11-(     )=0

(     )-9-8=1

15-7-(     )=0

17-(     )-1=7

(     )-9-4=3

17-(     )-5=6

(     )-4-10=2

11-0-(     )=1

(     )-0-8=4

14-5-(     )=1

12-8-(     )=0

17-(     )-13=1

(     )-4-14=1

(     )-6-6=0

16-7-(     )=7

17-13-(     )=3

(     )-16-1=0

16-3-(     )=12

14-0-(     )=1

20-(     )-3=4

14-(     )-1=5

19-14-(     )=3

(     )-4-6=9

15-11-(     )=0

(     )-7-2=2

(     )-12-4=1

(     )-4-3=5