Question

What is the domain and range of `x= 3`?

Answer 1

Depending upon your interpretation:
either
`color(white)("XXX")`the terms domain and range can't be meaningfully applied to `x=3`
or
`color(white)("XXX")`Domain: `{3}`; Range: `{x=3}`

Explanation:

A function is a mapping of values from one set, called the domain, into another set, called the range, with the provision that no single value in the domain can map into more than one value in the range.

`x=3` is not a function in the normal sense and therefore the terms domain and range are not applicable.

However you might argue that the relationship is `{3}rarrx`
so Domain`={3}` and the Range`={x=3}`