(     )-6=10

(     )-5=12

(     )-4=10

16-(     )=4

16-(     )=8

16-(     )=9

(     )-16=3

14-(     )=11

14-(     )=0

(     )-5=10

13-(     )=11

14-(     )=13

14-(     )=10

(     )-0=18

(     )-8=7

(     )-8=8

(     )-4=7

16-(     )=5

17-(     )=13

14-(     )=8

18-(     )=7

18-(     )=15

16-(     )=16

(     )-0=20

(     )-2=10

(     )-5=8

19-(     )=0

16-(     )=2

14-(     )=9

(     )-10=5

12-(     )=1

20-(     )=11

(     )-11=9

11-(     )=1

18-(     )=11

(     )-1=11

18-(     )=0

13-(     )=1

(     )-11=0

17-(     )=16

(     )-10=2

18-(     )=6

(     )-10=4

14-(     )=10

(     )-1=10

11-(     )=6

(     )-18=0

13-(     )=1

(     )-16=4

15-(     )=6