First of all, there are many different ways to express 3 in set builder notation, to be more precise, there are many different ways to express the set containing 3 as its only element.
Here are a few ways
{x∈R | x=3}
or
{x∈N | 2<x<4}
or even just
{3}
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{x|~<x<-3}
the set builder notation would be {x|(x=2n)^(28>=x>=4)
= x²-3x0 =
don't know too
X = {x:x is a factor of 15}