To any set that contains it!
It belongs to {5.385164807},
or {45, sqrt(2), pi, 5.385164807, -3/7},
or all numbers between 4 and 53,
or rational numbers,
or real numbers,
or complex numbers,
etc.
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It can be element of: Rational numbers or Real numbers
The additive identity for a set is a number (denoted by 0) such that a + 0 = 0 + a = a for all elements a which belong to the set.
Root 6 is an irrational [real] number.
There are many sets of numbers -14 belongs to:set of negative integersset of rational numbersset of real numbersset of complex numbers, which is the biggest known number set
The set of numbers which 3 does not belong is the set of even numbers.