( )+ 6 = 18 18 -( )=5 6 + 4=( ) 11 -( )=10 ( )+ 5 = 12 15 -( )= 1 ( )+ 2 = 5 19 -( )=7 1 + 12=( ) 6 -( )= 3 7 +( )= 11 ( )+ 7 = 15 5 -( )= 2 2 + 12=( ) 10 -( )= 8
( )- 2 = 1 5 -( )= 0 ( )- 10 =2 1 + 2 =( )( )- 8 =16 7 +( )= 10 ( )- 8=15 17 -( )= 2 ( )- 5= 1 5 +( )= 10 ( )- 6 = 3 1 +( )= 8 ( )- 12= 2 1 + 11=( )( )- 8 = 11
( )- 15= 2 11 +( )= 15 ( )+ 9 = 12 0 +( )= 8
1 + 13=( ) ( )+ 1 = 8 2 +( )= 7 ( )- 8=10 6 +( )= 13 ( )- 3 = 10 12 +( )=1 5 ( )- 15= 0 11 + 8 =( ) 21 -( )= 1
( )+ 2 = 7
( )+ 11 = 15 8 + 3 =( )( )+ 1 = 8 10 + 7 =( ) ( )+ 8 = 10 7 +( )= 12 ( )+ 6 = 10 11 + 6 =( ) ( )+ 0 = 18 3 +( )= 10 ( )+ 5= 10 5 +( )= 8 ( )- 9=7 6 +( )= 18 ( )- 7 = 12
1 + 7 =( ) ( )- 3=4
5-( )= 0 3 + 7 =( ) ( )+ 5 = 5 10 -( )=4 9 +( )= 15 ( )- 10 = 8 5 + 10 =( )14 -( )= 2 ( )+ 3 = 9 11 + 5=( ) 8 +( )= 9 ( )+ 7 = 13 13 + 7 =( )
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