Question 1203468
.
<pre>

The problem does not describe the domain of the given function.
@MathLover1 solved the problem, assuming that the function is defined over 
complex numbers.


To me, it is strange assumption, since for complex numbers, standard designation "z" 
for a variable is usually used by default.


If "x" is used as a variable, it tells us, by default, that x is a real variable.


For real variable (in the real domain), our function is the sum of two addends,
of which first addend is defined everywhere on the number line,
while the second addend has only one point where it is undefined: x= 0.


So, from this point of view, the answer to the problem's question is 1:
there is one and only one point in the number line, where the given function is undefined.
</pre>

<H3>The post-solution notice for the problem's composer:</H3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;- in such problems, &nbsp;pointing the domain of a function is &nbsp;{{{highlight(highlight(MANDATORY))}}}.