11-(     )=0

19-(     )=9

(     )-16=1

(     )-6=8

11-(     )=10

(     )-1=11

(     )-5=6

(     )-0=15

13-(     )=3

(     )-1=14

15-(     )=10

(     )-7=10

(     )-10=3

(     )-1=11

19-(     )=1

(     )-5=11

16-(     )=13

(     )-15=0

(     )-10=6

(     )-15=2

(     )-4=11

(     )-2=16

(     )-1=13

(     )-4=7

(     )-14=1

(     )-3=14

13-(     )=0

17-(     )=15

(     )-0=20

(     )-2=9

19-(     )=12

14-(     )=14

13-(     )=5

11-(     )=11

(     )-6=5

15-(     )=4

(     )-8=6

(     )-19=1

15-(     )=12

(     )-1=11

15-(     )=2

11-(     )=2

13-(     )=13

19-(     )=0

(     )-8=7

(     )-12=1

(     )-11=0

(     )-8=12

(     )-13=6

(     )-7=7