(     )-4-15=1

(     )-3-4=8

(     )-1-7=4

11-7-(     )=4

(     )-4-5=9

17-(     )-5=8

11-(     )-0=3

20-(     )-2=3

(     )-10-1=3

15-(     )-1=10

(     )-2-0=13

20-14-(     )=0

(     )-10-0=3

(     )-16-3=0

(     )-7-3=5

19-(     )-2=0

18-(     )-3=0

(     )-0-9=10

15-(     )-8=4

12-9-(     )=0

17-14-(     )=2

12-7-(     )=0

(     )-1-10=6

(     )-7-4=1

(     )-3-4=6

12-2-(     )=8

18-(     )-3=2

18-16-(     )=0

(     )-10-0=2

(     )-10-9=1

14-11-(     )=2

(     )-12-1=1

(     )-4-10=1

(     )-2-1=13

(     )-7-0=9

(     )-8-6=1

19-(     )-6=3

13-(     )-9=3

14-(     )-7=4

17-13-(     )=2

(     )-2-4=8

17-11-(     )=3

17-(     )-13=3

17-(     )-2=7

14-12-(     )=0

12-4-(     )=5

17-1-(     )=3

20-(     )-0=18

(     )-14-2=1

12-(     )-0=2