7+=9
2+=13
42+=61
-4=0
-17=58
-43=57
82-=47
98-=34
108-=24
26+62=
35+48=
52+61=
6×8=
4×6=
3×4=

+39=99-44
-52=18+23
22++51=98
28+25+23+14=
25+17=85-
44+59-67-26=
93-46=+44
100-34-29-13=