How do you untilt?

I don't have much experience getting tilted, because I prefer looking at the gameplay instead of the outcome of the game, so I enjoy most of my games. However, when someone picks my main, or gets it on ARAM and doesn't want to swap, I just get so tilted that I literally can't play normally for a few games, like I just random flash and purposely miss stuff just because I'm so full of salt. That's why I mostly dodge when something like that happens, but I already dodged yesterday and don't want to wait in queue for half an hour, so I just played a tilting game and I have no idea how to untilt. Any suggestions?
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