Question: Use extended euclidean algorithm to solve for 3 1 2 5 ^ - 1 mod 9 9 8 7 There was a solution on here

Use extended euclidean algorithm to solve for 3125^-1 mod 9987
There was a solution on here that created a chart with ri, ui, vi, and qi. I understand where the ri and qi values came from (euclidean alg) but im not sure how ui and vi were found. pls explain! Final answer is 1844

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