1031 To Pay off Properties

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This has probably already been covered. I'm going for the lazy question instead of doing research tonight.

Say I have two single family homes. And they both double in price over 10 years. If I sell one, can I do a 1031 to roll that equity into pay off the mortgage on the remaining property?

Or if I had 20 SFHs, and sold 10, can I 1031 each of those to pay off the remaining 10 mortgages.. same question, really, just more properties.