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