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When multiclassed, you get half the HP of the class you have levelled up in. If your character was a fighter(d10)/thief(d6). If the fighter class levelled up, he would get half of the maximum hit points allocated to a fighter (half of 1d10) so would roll between 1 and 5 hit points + constitution bonuses. Similarly, the thief levelling up would get 3 hit points (half of 1d6) + constitution. If you levelled up both at the same time, you would roll (1d10 + 1d6) / 2 = 8 max hit points plus any constitution bonuses added.
At level 9, constitution bonuses no longer apply and fighters/rangers/paladins get 3 HP per level, thieves/bards/clerics/druids get 2 and mages get 1. So the 9d10 + 6 you would see for an eleventh level warrior means they have rolled a 10 sided dice 9 times (with constitution bonuses) and then +3 for levels 10 and 11.
Hope this helps
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