To determine when the expression \(-5 = \frac{4 - 3x}{4 - 3x}\) is undefined, we need to identify when the denominator equals zero.
The denominator in the equation is \(4 - 3x\). Setting it to zero gives:
\[ 4 - 3x = 0 \]
Now, solve for \(x\):
\[ 3x = 4 \] \[ x = \frac{4}{3} \]
Thus, the equation is undefined when \(x = \frac{4}{3}\).
The correct answer is:
4/3 (Start Fraction 4 over 3 End Fraction).