Riot MatchMaking

how is it not balanced?

one teams mmr is 1905 and the others is 1884

a total different of what 21 mmr ?

So you got your ass handed to you and obviously that's not because your team was not playing their best or because they got outplayed/snowballed on but because matchmaking was so unfair to you that you just had no chance of winning?

I'm sure you played that perfectly