Using the set builder notation, we can write; {-6 <x < 21}.
What is the set builder notation?
In mathematics, we use the set builder notation to decide the condition that must be satisfied under a given provision. In this case, the condition is that the set of integers less than -6 or greater than 21 .
In effect, we are saying that the integer must lie between -6 and 21 hence using the set builder notation, we can write; {-6 <x < 21}.
Learn more about set builder:https://brainly.com/question/17238769
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