18-(     )=13

(     )+6=14

(     )-3=14

3+(     )=17

0+(     )=18

16-(     )=12

(     )+0=18

(     )-11=7

(     )+3=20

14+(     )=17

5+(     )=19

(     )+6=14

12-(     )=9

15-(     )=6

(     )+8=16

(     )-9=6

(     )+16=20

(     )-3=9

(     )+6=11

15+(     )=19

(     )+11=18

15-(     )=3

17-(     )=8

(     )+5=14

(     )+0=11

16-(     )=9

15-(     )=5

13-(     )=10

(     )-3=13

(     )-7=5

13+(     )=13

1+(     )=14

16-(     )=9

(     )+1=13

18-(     )=4

(     )+3=13

9+(     )=13

(     )+4=12

(     )+2=12

18-(     )=1

(     )+9=14

13-(     )=6

(     )-1=12

14-(     )=6

6+(     )=20

(     )-0=13

20-(     )=17

4+(     )=19

(     )-14=6

8+(     )=18