WHY +30LP and - 10 LP

Henlo! Today i did my placement games. i Was put in bronze 3 , i did some games and now im silver 3 in promo for silver 2. But when i win i get +30-40 LP and when i lose i -10 LP. ( i play with golds 3-4).Why? {{sticker:slayer-pantheon-rainbows}}
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