<h3>
Answer:</h3>
The domain of the function f(x) is:
All real numbers.
<h3>
Step-by-step explanation:</h3>
We are given a linear function f(x) in terms of the variable 'x' as:

Now we are asked to find the domain of the function f(x).
<em>We know that the domain of a function is the possible set of the x-values where the function is well defined that is the function does not gives a absurd result.</em>
As we know that the polynomial function i.e. here a linear polynomial function is defined all over the real axis and is also continuous there.
The graph of this linear function will be a straight line.
Hence, the domain of the given function f(x) is:
All real numbers.