somebody explain how rr system works?

Please somebody explain this. Got match MVP but still deducted so much...
img: https://imgur.com/a/3NN40ns

RR is based on round won/lost and your performance compared to YOUR average. performance has a smaller impact on higher ranks. whats really important aswell is the mmr of you and your opponent, if you lose as silver 3 against a team full of bronze you lose more rr. Now I keep in mind I said MMR and not rank. most of the time your rank and your mmr is pretty close but especially smurfs or accounts that only play 2 games a month might have a rank that is way lower or higher than the rank displayed.
So I assume the systems thinks that you are usually better than your opponents but you still lost so you lose more RR