Question

(-5+3)-{1-[7-(8+12-4)-7]-35+(4+18-15)}

Answer 1

{(-5+3)-{1-[7-(8+12-4)-7]-35+(4+18-15)}
-2-{1-[7-(20-4)-7]-35+(22-15)}
-2-{1-[7-16-7]-35+7
-2{1-[7-9]-35+7
-2{1-[-2]-28
-2{1-2-28}
-2{1-30}
-2{-29}
-2-29
-31

Answer 2

(-5+3)-(1-(7-(8+12-4)-7)-35+(4+18-15)
-2-(1-(7-(20-4)-7)-35+(22-15))
-2-(1-(7-16-7)-35+7)
-2-(1-(-16)-28)
-2-(1+16-28)
-2-(17-28)
-2-(-11)
-2--11
-2+11
9

SUERTE!!!