3-{2+[24:(3x3+3)x5-6]:4}=
= 3-{2+[24:(9+3)x5-6]:4}
= 3-[2+(24:12x5-6):4]
= 3-[2+(2x5-6):4]
= 3-[2+(10-6):4]
= 3-(2+4:4)
= 3-(2+1)
= 3-3
= 0