17+(     )=18

12-(     )=0

(     )+3=13

13+(     )=17

9+(     )=15

(     )-8=4

15+(     )=17

3+(     )=12

16+(     )=16

(     )+6=13

(     )+10=20

(     )+6=17

20-(     )=16

(     )-0=13

(     )+8=17

(     )+11=18

(     )-3=13

14-(     )=1

(     )-10=8

1+(     )=19

13+(     )=15

(     )-18=2

(     )+8=18

19-(     )=18

(     )+12=13

(     )+12=12

2+(     )=18

12+(     )=16

3+(     )=19

(     )-3=11

19-(     )=12

(     )+16=19

(     )-4=13

(     )-9=11

16-(     )=3

12-(     )=12

10+(     )=20

(     )-14=4

19-(     )=18

13-(     )=2

18+(     )=18

(     )-9=6

13-(     )=2

(     )+12=16

(     )+11=11

(     )-11=9

12+(     )=17

(     )-5=6

11+(     )=18

(     )+16=20