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Answers and rating deltas for

Can anybody explain me this highlighted line of code?

Author Votes Δ
molamk 3 +4.57
ellipsis 2 +1.14
R3tep 2 +0.96
Nina Scholz 1 -1.18
alex 1 -1.02
Ali 0 -3.25
Last visited: Jun 17, 2019, 2:59:36 PM