42+=63
38+=81
88+=144
-25=62
-47=82
-42=165
99-=35
133-=43
199-=125
38+48=
47+73=
136+158=
3×9=
6×8=
7×9=

-34=138-64
26+36+46+56=
98-25=+43
39+47+46-123=
64++66=195
88+23-46-58=
49+-99=35
200-67-88-32=