About ranking system

So, I just hit Masters yesterday after having a hard time to deal with the ranking system. I thought after I past through Diamond 1 I could have get rid of it . I'm increasing 15LP per win and suffer 22LP per lose for some reasons. Can I have a detailed version of how ranking systems works ?? Its so frustrating to play SoloQ when its almost end season now(rushing Challenger). That moment when you gave it your all and win 2-3 games and you would still end up 0 LP after 2 loses , what a joke.
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