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Edufirst
Given that the division by zero is undefined, the rational expression will be undefined where its denominator is equal to zero.

So, you need to determine for which x-values 3x + 9 = 0

=> 3x = - 9

=> x = - 9 / 3

=> x = - 3

Answer: - 3 is all and the only value of x that make the rational expression given undefined.
jaseistrans

Answer: -3

A. On E 2020

Step-by-step explanation:

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