-3
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It belongs to any set that contains it: for example, {4.75, -12, pi, sqrt(5), 29}. It belongs to the set of integers which is a proper subset of rational numbers which is a proper subset of real numbers which is a proper subset of complex numbers. So -12 belongs to all the above sets.
20 and 30, for one.
Here are some sets of numbers that have the greatest common factor of 12: 12, 36 12, 288 24, 84 24, 48, 60 60, 96 144, 156
12
The numbers are: 12 and 72