If I buy into an LLC am I responsible for debt incurred before I was listed as a partner?

Question Details:

LLC was established in April; in September I purchased 20% of the LLC. I have 2 partners who own 40% each. They did incure debit before I become a partner and now the business is struggling. I am the only partner running the business and am trying to pay back debt along with keeping the business going. If a company tries to sue us for costs they incured before I was a partner am I legally responsible also?

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