credit card that is all paid off with a zero balance, is it good to close the account or keep it open

Quoting REAL PERSON WITH CREDIT QUESTIONS
Hi! Your website was very helpful. I was just wondering if I am not using a credit card that is all paid off with a zero balance, is it good to close the account or keep it open? How does this affect my score?
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Depends on what OTHER credit you have.
If you have 3 currently active OTHER accounts then closing would be fine. If
not then I recommend you use the account.
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