loss impact in placements

My question: how does a loss affect your placement? I just went 13-7-19 with mundo, so I didn't play a bad match. our adc ezreal went 8-16-21, so he didn't play that good. Does this loss have a bigger impact on him compared to me? Or does a loss always have the same impact on your placement? (it was my 2nd placement match after winning the first one on sona support)
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