plat 4 support and im matchmaded with a gold 4 adc in solo duo??

how is this a normal matchmaking in riot's eyes? the dude was so bad that at the end of the match i dealed more dmg then him and im the support. next thing i will get a bronze 2 guy as adc? i never had a diamond 4 adc to play with me and carry the game so why do i get a gold 4 to carry then? not that i managed to do that i finished 1/11 and definitly not happy bout it.
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