Question

-20-{-4-[-8+(+12-6-2)+2+3]} tem que da 15

Answer 1

-20[ -4] -[-8 +4+2+3]
-20 - 4+8+4+2+3
24+12+5 = 41

Answer 2

-20-{-4-[-8+(+12-6-2)+2+2]}
-20-{-4-[-8+(6-2)+2+2]}
-20-[-4-(-8+4+2+2)]
-20-[-4-(-4+2+2)]
-20-[-4-(-2+2)]
-20-(-4)
-20+4
-16