How does LP work??

Sorry if it's in a wrong board (it is the only option i can click tho??) Yesterday I played two ranked games,we won the first one and I got +22 LP but after we lost the second one I lost -18 LP. It doesn't make sense to me because it seems like i lost too much in comparison to what I gained. Why did I lose so much after I gained +22 LP? How am I supposed to climb???
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