Answer
$x=0$
Work Step by Step
Since division by zero is undefined, we have to exclude the values that make the denominator zero.
The denominator is $3x$, which equals to zero if $x=0$
Therefore for $x=0$ the rational expression is undefined.
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 7 - Section 7.1 - Rational Expressions and Their Simplification - Exercise Set - Page 491: 2
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