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