Question

(15-6)+3-[(20-5•2)+(5+24÷4)]-(-3)=

Answer 1

(15-6)+3-[(20-5•2)+(5+24÷4)]-(-3)=9+3-[(20-5•2)+-[(20-5•2)+(5+24÷4)]-((5+24÷4)]-(-3)=9+3-[(20-10)+(5+6)]+3=12-[10+11]+3=12-[21]+3=12-21+3= - 6

Answer 2

(15 - 6 ) + 3 - [(20 - 5 . 2) + (5 + 24 : 4) ] - (-3) =
9 + 3 - [(20 - 10) + (5 + 6) ] - (-3) =
9 + 3 - [ 10 + 11 ] - (-3) =
9 + 3 - 21 - (-3) =
12 - 21 - (-3) =
-9 - (-3) =
-9 + 3 = (Aplicamos supresión de paréntesis)
-6