11+(     )-0=15

17+(     )-1=17

(     )-1+0=19

6+(     )-6=7

(     )+13-1=19

(     )+8-5=7

(     )+0-0=18

(     )-1+3=16

4+11-(     )=5

(     )-10+2=9

11+3-(     )=12

(     )-3+13=15

16-6+(     )=18

18-7+(     )=13

(     )+6-3=16

7+(     )-3=10

11+(     )-1=11

(     )-2+5=14

13+6-(     )=19

6+(     )-6=9

17+(     )-0=19

3+(     )-4=7

11+4-(     )=11

(     )+1-1=17

19-4+(     )=18

17-(     )+15=17

15+(     )-3=15

(     )-5+6=14

2-2+(     )=19

7-2+(     )=14

17-2+(     )=19

11-1+(     )=13

14+(     )-0=14

8+(     )-1=19

9-(     )+17=19

(     )+12-11=9

18+(     )-0=20

19+(     )-1=19

20-(     )+12=13

6+5-(     )=9

(     )+1-0=11

7-(     )+12=15

18-(     )+2=18

6+(     )-4=10

9-5+(     )=18

20-(     )+7=8

20+(     )-0=20

14-(     )+3=4

(     )+4-4=13

(     )+13-2=14