Can someone explains This MatchMaking system for me?

i want an answer. as a member of this game i have rights to some one answer me this question . look at my last match : i busted my ass to get my self to plat because i wanted to play with "PLAT"(decent) players. if i wanted to play with silvers why the %%%% i try so hard to hit plat? somebody explains to me why i have a silver jungler in my plat GAME. i WANT ANSWERS RIOT.
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