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Avernus

Avernus was an ancient name for a crater near Cumae, Campania. It was believed to be the entrance to the underworld. In later times, the word was simply an alternate name for the underworld.

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... solutions for x and y are all pairs of numbers that are additive inverses; 3x + 9 = 3(x + 3), whose solutions for x are all numbers. Example 4 is ...