To determine when the equation \(-5 = \frac{4 - 3x}{4 - 3x}\) is undefined, we need to analyze the denominator.
The expression \(\frac{4 - 3x}{4 - 3x}\) is undefined when the denominator is zero, which occurs when:
\[ 4 - 3x = 0 \]
Now, we solve for \(x\):
- Add \(3x\) to both sides:
\[ 4 = 3x \]
- Divide both sides by \(3\):
\[ x = \frac{4}{3} \]
Thus, the equation is undefined when \(x = \frac{4}{3}\).
So the correct response is:
43 \( \frac{4}{3} \)