Question

-4+10-6+8-7-3-20+30​

Answer 1

Vamos por partes.
(-4+10)-6+8-7-3-20+30=
(6)-6+8-7-3-20+30=
0+8-7-3-20+30=
(0+8-7)-3-20+30=
1-3-20+30=
(1-3)-20+30=
-2-20+30=
-22+30= +8.