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I'm not sure how to explain it in words, so I'll give you two examples.

1. Let's say we have a graph with the domain {x: -5<0} u {x: x>7}

This means that in the graph, x has every value between -5 and 0 (exclusive), and every value over 7. So in the graph, x can not be -6, -5, 1, 2, 3, and etc.

2. Another example of this is in a Venn Diagram

The union of a Venn Diagram is the addition of the 2 circles of the Venn Diagram, and subtracting their intersection.

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Q: What it is a union in math?
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