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