That is income from renting out personal property assuming you are not in the business of renting property. You can enter that in "Less Common Income" section. Use "Miscellaneous" and you will find the "Income from renting out personal property (not rental real estate or farm rentals)" topic. This will go to line 8L on your schedule 1 and not be subject to self-employment taxes.
If your business is renting out property then you would use the self-employment topic and the income is subject to self-employment taxes.
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