Any set that contains -1.2, whether finite or infinite.
For example,
the set consisting of only -1.2 ie {-1.2},
the set consisting of -1.2 and 5 = {-1.2,5},
the set consisting of -1.2 and 3 and sqrt(17) = {-1.2,3,sqrt(17)}, and so on.
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-12 belongs to at least the sets of all numbers, of integers and negative integers, of rational numbers and negative rational numbers, and all negative numbers.
The set of numbers which 3 does not belong is the set of even numbers.
10 belongs to the set "natural numbers", but it can also belong to whole numbers, and rational numbers
The set of even numbers
WHole
Integers