how do provisional ranks work?

we know how the climibing ranks system work which is amassing lp then promotions etc etc but how does your given first rank on the account is calculated? I was given the same exact rank on 2 different regions playing the same champ and i only wonder how the system can accurately tell my skill level no matter what the opposition is and what my teammates ranks are (which were different for some reason) so how does it tell? does it count your performance in game? like kda and cs and whether you won or lost? how exactly does it work
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