"I am 50% owner of a LLC corporation my partner opened a business checking account for the business with only him signed on the account. he now owes

I assume that the $7000 comes from overdrafts on this checking account.  Normally, the members of an llc or the shareholders of a corporation (not clear whether which you are) are not personally responsible for the entity's debts, thus you should not (nor should your co-member/co-chareholder) personally be liable for the $7,000 (unless one or both of you personally guaranteed the obligation), but of course, the entity's $7,000 obligation will affect your bottom line, because your share of its profits (if any) will be diminished.