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How long ago were those lates? They are already on your report so not positive but don’t think it matters if acct is open or closed they will still report til they fall off, I’d keep the older one with lower interest,, if you do try and combine make sure to request cli before you do think that resets the 6 month wait, and what are your scores like? You can go on discoverscorecard and get free score and see if preapproved for their card there