15-(     )=14

(     )-11=6

(     )-2=12

18-(     )=11

(     )-4=8

(     )-4=8

13-(     )=10

(     )-7=6

11-(     )=4

17-(     )=14

13-(     )=13

(     )-12=0

16-(     )=14

17-(     )=4

(     )-16=0

14-(     )=9

14-(     )=13

15-(     )=15

11-(     )=4

(     )-6=8

13-(     )=8

(     )-11=3

(     )-1=19

(     )-9=11

17-(     )=13

(     )-2=17

(     )-12=1

12-(     )=9

19-(     )=12

12-(     )=9

11-(     )=10

17-(     )=10

(     )-3=10

(     )-18=2

(     )-15=0

13-(     )=13

(     )-12=2

(     )-6=5

12-(     )=5

20-(     )=9

(     )-12=6

(     )-6=13

16-(     )=9

16-(     )=14

20-(     )=18

(     )-13=7

15-(     )=3

18-(     )=8

(     )-5=14

(     )-14=3