11-(     )=1

(     )+14=18

14-(     )=13

(     )-9=2

(     )-14=6

14+(     )=17

(     )-13=0

13+(     )=13

19+(     )=20

1+(     )=17

(     )+2=20

(     )-8=11

(     )-9=2

16-(     )=9

(     )+1=13

(     )+3=16

1+(     )=13

(     )-2=12

9+(     )=19

18-(     )=12

(     )+9=12

(     )-10=2

(     )-14=5

(     )+5=19

9+(     )=20

(     )+3=12

(     )-1=15

13-(     )=7

(     )-9=7

17-(     )=17

(     )+2=17

(     )+13=19

(     )+16=18

12-(     )=7

1+(     )=19

(     )-9=2

11+(     )=18

13+(     )=15

(     )-12=1

18-(     )=6

11-(     )=9

(     )-8=3

11+(     )=12

20-(     )=5

(     )-11=1

18-(     )=2

(     )+15=17

15-(     )=10

19-(     )=7

13-(     )=2