The resulting union {x | x > -5} ∪ {x | x < 5} is all real number except the value of 5.
Set theory
Sets are collection of values and numbers but not arranged in a pattern.
Given the union of sets {x | x > -5} ∪ {x | x < 5}
The first set contain all real numbers greater than -5 while the second set contains all real number less than 5. Since 5 is not included in both set, hence;
{x | x > -5} ∪ {x | x < 5} = {all real numbers except 5}
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