What is the set of numbers to which $-72/8$ belong?

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Answer 1 · 2016-11-05T22:16:19

At first sight it belongs to the rational numbers (and it does)

But since $-72/8=-9$ it also belongs to the subset of whole (negative) numbers.

Being negative, it does NOT belong to the set of natural numbers.

What is the set of numbers to which -72/8-72/8 belong?