13-7-(     )=1

12+(     )+0=19

(     )+10+5=20

12-(     )-3=2

(     )-12-2=2

1+(     )+1=20

16-(     )-0=8

17-(     )-7=8

14-6-(     )=8

12-(     )-0=9

1+15+(     )=19

14-(     )-2=7

5+(     )+0=18

(     )+0+13=18

(     )+7+1=20

3+11+(     )=19

20-(     )-9=0

9+8+(     )=20

(     )+1+10=13

(     )+15+4=20

16-(     )-0=3

17-(     )-1=1

19-(     )-16=3

7+(     )+11=20

18-(     )-3=15

19-8-(     )=10

(     )-10-5=1

11-8-(     )=2

6+7+(     )=18

18-(     )-2=6

(     )-9-11=0

(     )+4+9=15

(     )+3+7=12

19-(     )-1=0

13-(     )-3=8

16+(     )+3=19

(     )-11-2=3

(     )+1+1=20

18+1+(     )=19

15-10-(     )=4

11-(     )-9=0

5+(     )+12=20

4+3+(     )=12

11+1+(     )=18

13+0+(     )=14

14-13-(     )=1

16-4-(     )=2

15-5-(     )=9

(     )-2-7=6

(     )-3-13=0