Find all values of the variable x for which the rational expression is undefined.
x
x
+
3
\displaystyle \frac{{x}}{{{x}+{3}}}
x
+
3
x
The expression is undefined when
x
\displaystyle {x}
x
=
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Enter your answer as a list of integer or decimal numbers separated with commas: Examples: -4, 3, 2.5172
Enter DNE for Does Not Exist, oo for Infinity