How does MMR work in League of Legends?

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Tags

1. #skill
2. #ranking
3. #account
4. #certain
5. #league
6. #players
7. #defeat
8. #games
9. #determines
10. #which
11. #actual
12. #rating
13. #hidden
14. #shortly
15. #amount
16. #points
17. #queue