2+=8
8+=16
13+=21
-4=3
-14=18
-12=35
56-=28
75-=22
90-=45
24+22=
28+43=
43+57=
4×6=
5×6=
6×6=

+25=75-32
-22=14+16
12++34=69
36+26+16+6=
18+=32-
13+32-18+5=
-22=+22
100-13-26-37=