14-8=       15-7=         13-7=       8+6=

2+10=         8+3=         14-9=        11-6=

13-9=        16-6=      11-8=          18-9=

17-8-3=       13-4+9=       14-7+5=   11-5+7=

11-6+5=     17-7-3=        18-9-9=      6+9-8=