11-( )=1
( )+14=18
14-( )=13
( )-9=2
( )-14=6
14+( )=17
( )-13=0
13+( )=13
19+( )=20
1+( )=17
( )+2=20
( )-8=11
( )-9=2
16-( )=9
( )+1=13
( )+3=16
1+( )=13
( )-2=12
9+( )=19
18-( )=12
( )+9=12
( )-10=2
( )-14=5
( )+5=19
9+( )=20
( )+3=12
( )-1=15
13-( )=7
( )-9=7
17-( )=17
( )+2=17
( )+13=19
( )+16=18
12-( )=7
1+( )=19
( )-9=2
11+( )=18
13+( )=15
( )-12=1
18-( )=6
11-( )=9
( )-8=3
11+( )=12
20-( )=5
( )-11=1
18-( )=2
( )+15=17
15-( )=10
19-( )=7
13-( )=2