But I got one more amount in 2019, which was reported again on 19A
Do I have to put the sum of both years for the selling price or just the amount from 2020?
No because that wasn't sale proceeds. But you may have to adjust your basis because of prior year distributions or allocation of partnership income/loss, which results in the gain calculation. See Pub 541 page 10 "adjusted basis". https://www.irs.gov/pub/irs-pdf/p541.pdf
This is very complicated stuff.
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