13-5= 6+8= 10+10= 1+12= 13-5=
2+16= 7+7= 5+8= 8+5= 20-6=
15-5= 20-3= 3+16= 2+14= 5+3=
( )+9=10 ( )+2=11 9+( )=16 9+( )=15
9+( )=17 ( )+9=18 5+( )=14 ( )+9=19
9+( )=13 ( )+6=15 8+( )=12 7+( )=11
8+( )=15 7+( )=13 ( )+3=12 7+( )=16
( )+9=18 ( )+8=11 8+( )=16 ( )+7=12
7+( )=13 ( )+6=14 7+( )=12 7+( )=11 ( )+7=16
( )+7=11 7+( )=16 7+( )=15 9+( )=12 ( )+9=16
3+( )=12 6+( )=14 ( )+6=15 7+( )=11
5+( )=14 ( )-7=5 ( )-7=2 ( )-7=7
( )-7=4 ( )-7=6 ( )+4=16-7 ( )-5=18-9