Question

-13- {-3+6- [- (-2-9)-4 ] - (6-3)-5} - (3-6)-3

Answer 1

-13- {-3+6- [- (-2-9)-4 ] - (6-3)-5} - (3-6)-3
-13-{+3-[+2+9-4] -6+3-5} -3+6-3
-13-{+3-2-9+4-6+3-5} 0
-13-{ +8} 0
-13-8
+21.

Rpta : 21

#Espero que te sirva ;)

Answer 2

-13- {-3+6- [- (-2-9)-4 ] - (6-3)-5} - (3-6)-3

-13-{3-[-(-11)-4]-3-5}-(-3)-3

-13-{3-[11-4]-8}+3-3

-13-{3-7-8}+0

-13-{-12}
12-13 = -1