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I'm going to take my stab at rephrasing the formula as it tripped me up to.
It's asking to find an x in S such that any y in S means y <= x.
So, it's asking which element in S is greater than or equal to any other element in S, including itself? This would be 19 because it is the greatest element in the set, therefore it is greater than or equal to all the other elements in the set.