python code begginer

[abdielG252]

Hello I'm new in this page. I'm a beginner in python, and i have a question about this program.
I need to do this exercise:
Write a program to remove the duplicates in a list.
And i write this program:

n = [5, 3, 6, 7, 5, 5, 6, 7, 8, 3, 6, 5, 7, 8, 3, 4, 6, ]
for i in n:
    if n.count(i) > 1:
        n.remove(i)
print(n)

this is the answer: [5, 7, 3, 5, 7, 8, 3, 4, 6]
Can anyone tell my why this program doesn't work?
Sorry for my English, I'm learning. Thanks and regards