15-7= 8+5= 7+6= 18-9=
19-5= 12-9= 16-8= 11-2-1=
8+8= 9+5= 13-5= 12-3+3=
15+4=
12-5=
4+9=
8+7-9=
14-8=
16-9=
15-6=
17-8+5
57-7=
40+5=
70+8=
80-50-10=
8+20=
57-50=
35-5=
14-5+90=