Question

20-(-10-[-8+(5-12)]-20

Answer 1

20+10+8+(-7)-20
30+8-7-20
38-7-20
31-20
+11

Answer 2

20−(−10−(−8+5−12)−20)
20−(−10−(−3−12)−20)
20−(−10−−15−20)
20−(−10+15−20)
20−(5−20)
20−−15
20+15
35  minha conta deu essa mais não tenho certeza