41-(     )=0

(     )-42=8

(     )-30=0

46+(     )=50

31-(     )=3

(     )-27=1

21-(     )=19

(     )-18=5

1+(     )=34

42+(     )=45

35+(     )=50

42-(     )=26

31+(     )=49

(     )-21=2

38-(     )=27

(     )-16=9

(     )+12=47

23+(     )=32

17+(     )=28

(     )-35=3

45-(     )=24

23-(     )=21

26+(     )=40

(     )+20=35

(     )-10=36

24+(     )=46

(     )-20=16

43+(     )=48

0+(     )=35

21-(     )=2

(     )-25=13

22-(     )=6

(     )+16=49

(     )+28=35

32+(     )=43

(     )-13=12

13+(     )=40

(     )+8=28

39+(     )=40

39-(     )=21

(     )+1=39

(     )+25=44

22-(     )=22

36-(     )=12

(     )-12=33

4+(     )=32

(     )+13=34

(     )+21=34

(     )-49=0

(     )+20=27