40-(     )=39

(     )+5=50

13+(     )=31

(     )+0=47

(     )-10=30

34-(     )=27

38-(     )=15

26-(     )=22

32+(     )=40

2+(     )=28

21+(     )=37

(     )+15=38

(     )+25=34

(     )-25=2

28-(     )=17

40-(     )=0

26-(     )=13

(     )+20=43

(     )+22=40

(     )+2=48

13+(     )=21

37+(     )=37

(     )+18=24

41+(     )=45

20+(     )=48

(     )-11=14

19+(     )=41

(     )+22=34

(     )-19=30

48+(     )=48

38+(     )=40

(     )-10=18

2+(     )=27

21+(     )=24

(     )-12=36

0+(     )=50

34-(     )=4

38+(     )=38

41+(     )=41

48+(     )=50

32-(     )=3

(     )-26=16

38-(     )=13

19+(     )=22

(     )+23=39

34-(     )=16

(     )-17=13

21-(     )=3

(     )-7=37

(     )-3=21