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11-101.

What number is not part of the domain of $f\left(x\right)=\frac{3}{x+5}$? How can you tell?

What $x$-value(s) would not produce a possible output ($y$) value?

We cannot divide by $0$. Therefore, what value of $x$ will make the denominator $0$?

$x$ cannot equal $-5$.