62 + (74 + 4) : 8 - 54 : 6 3 =
62 + (28 + 4) : 8 - 54 : 6 3 =
62 + 32 : 8 - 54 : 6 3 =
62 + 4 - 54 : 6 3 =
66 - 54 : 6 3 =
12 : 6 3 =
2 3 =
6

Therefore, the final answer is 6.