0
The domain is all the input (X) values for your function, and the range is all the output (Y) values. So the only time they are equal would be when the X values are mapped to themselves (if X=Y).
Although quite boring considering this one function, using a restricted domain and range one can make them equal for other functions aswell.
Before you just accept what i've written wait for someone else to either confirm or contradict what i've written as although i'm pretty sure this is correct im only human.
Hope this helps.
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