Question

-15+10=
+20-8=
+10+2+7=
+20+10+5-20=
-80+100=
-100+120=
180-200=
0-4+10=
-30+0-40=
-2-5-6-10=
-21+20=
-3+3-4=
-30+30=
41-50=
-52+58=
-21+10-28=
-6-9+18+10=
-8+9-1=
-100+300=
-500+400=
-100+200-300=

Answer 1

-5
-12
19
15
20
20
-20
6
-70
-23
-1
-4
0
-9
6
-39
13
0
200
-100
-200