17-(     )-4=1

(     )+9+3=12

(     )+1+0=17

2+16+(     )=20

17-(     )-8=8

(     )-7-7=3

15-(     )-2=7

(     )-17-1=1

9+(     )+2=18

12-(     )-1=2

(     )+0+5=16

(     )+9+10=19

1+14+(     )=15

(     )+1+2=19

15-11-(     )=1

13+3+(     )=19

14-(     )-1=4

15+2+(     )=20

14+(     )+2=18

15+4+(     )=20

(     )+1+3=19

(     )+7+3=19

(     )-3-4=13

15-(     )-8=1

19+1+(     )=20

5+(     )+2=12

(     )+0+1=18

8+11+(     )=20

(     )-14-2=2

10+(     )+2=12

12+1+(     )=17

20-4-(     )=13

(     )-11-0=2

0+15+(     )=17

7+(     )+6=15

9+(     )+2=20

1+(     )+10=20

(     )+15+1=20

(     )+4+5=13

15-(     )-5=0

(     )+3+1=20

2+9+(     )=11

18-(     )-0=16

5+1+(     )=12

17+(     )+0=19

19-(     )-4=14

19-(     )-2=5

14+3+(     )=17

12+(     )+0=20

(     )-9-4=2