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answered by @GAVEN STEASY in previous posts.
From the Sololearn FAQ:
How are XPs calculated in the Challenges?
The XPs you gain/lose are unique to each match. Calculations take the opponents' levels into account. We use a modified version of the Elo rating system to calculate the points for each won/lost challenge. You can learn more about the Elo rating system here:
https://en.wikipedia.org/wiki/Elo_rating_system