Please reason step by step, and put your final answer within \boxed{}.
A vessel of capacity 2 liters has 35% of alcohol and another vessel of capacity 6 liters has 50% alcohol. The total liquid of 8 liters was poured out into a vessel of a certain capacity and the rest of the vessel was filled with water. The new concentration of the mixture is 37%. What is the capacity of the vessel that the mixture was poured into?
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