4-=4
12-=3
17-=6
-0=9
-7=7
-5=34
2+=10
9+=17
7+=30
13+7=
22+25=
99+8=
44-12=
26-19=
100-6=

-4=13-9
+5=12+8
7++10=25
-12-4=4
12+=-10
12+16+12+23=
15-=+12
61+28-14-12=