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The mathematically correct answer is: any set that contains it.

For example, it belongs to

the set of all numbers between -3 and +2,

the set {0, -3, 8/13, sqrt(97), pi},

the set {0},

the set of the roots of x3 - x2 + x = 0,

the set of all integers,

the set of all rational numbers,

the set of all real numbers,

the set of all complex numbers.

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