6-(     )+15=16

9+10-(     )=9

(     )-1+18=18

2-(     )+16=16

10+(     )-4=12

(     )+20-4=16

(     )-2+18=18

(     )+3-1=14

(     )+0-0=19

14-8+(     )=13

3-(     )+15=15

20+(     )-0=20

0+18-(     )=7

7+(     )-0=11

18+(     )-1=18

(     )-5+15=17

(     )-0+1=19

15-(     )+12=18

(     )-11+4=5

(     )+5-2=9

20+0-(     )=20

(     )-11+14=16

(     )-2+18=19

16-(     )+4=13

5-(     )+8=13

19+(     )-0=19

(     )-13+6=13

0+15-(     )=5

6+10-(     )=10

16-9+(     )=12

11-(     )+7=16

16+(     )-0=16

(     )+6-6=7

12-12+(     )=10

4-0+(     )=18

6-0+(     )=13

14+(     )-0=14

5-5+(     )=15

10+(     )-7=10

16+1-(     )=17

(     )-2+10=16

(     )-16+11=15

(     )-8+14=16

16-(     )+11=19

12+(     )-8=12

(     )-2+10=18

(     )+3-3=10

16+(     )-0=17

6-6+(     )=11

(     )-0+14=19