To many factors involved - does not always make sense. I recently had a negative TL deleted and score actally went down 20 points. Go figure. The system is not fair.
if closing the account(s) will raise your utilization, lower the average age of open accounts, or make you not have revolving credit card or revolving charge card accounts then it will lower your score. otherwise go ahead. but the only account you usually want to close is a new one with a low credit limit if you have very low utilization.