15-14-(     )=0

12-(     )-9=0

16-(     )-1=6

18-(     )-11=5

(     )-14-0=5

(     )-10-3=0

19+0+(     )=20

(     )-6-2=9

3+12+(     )=18

14-4-(     )=0

17+1+(     )=18

8+8+(     )=20

20-17-(     )=0

17+0+(     )=20

4+15+(     )=20

16+2+(     )=19

5+6+(     )=15

(     )-0-13=6

20-(     )-4=13

(     )-13-4=2

7+7+(     )=17

(     )-13-0=1

17+(     )+1=18

(     )-7-1=3

19-(     )-2=4

(     )-7-1=3

(     )-6-3=7

11+5+(     )=17

8+(     )+1=14

13+(     )+2=18

(     )-5-2=12

(     )-10-1=2

11-(     )-2=2

(     )-7-8=4

16-15-(     )=0

11+(     )+1=20

0+14+(     )=17

(     )+1+0=19

(     )-4-1=14

18-11-(     )=2

16+(     )+4=20

(     )+8+0=19

2+2+(     )=12

5+(     )+2=14

16-(     )-5=0

16-(     )-5=4

12+(     )+0=18

15+1+(     )=19

16-12-(     )=1

(     )-9-1=5