Find all excluded values for the expression. That is, find all values of \( u \) for which the expression is undefined \[ \frac{5 u-3}{2 u-4} \] If there is more than one value, separate them with commas.

To find the excluded values for the expression \( \frac{5u-3}{2u-4} \), we need to identify when the denominator equals zero, as division by zero is undefined. Set the denominator equal to zero: \[ 2u - 4 = 0 \] Solving for \( u \), we add 4 to both sides: \[ 2u = 4 \] Now, divide both sides by 2: \[ u = 2 \] Thus, the only excluded value for the expression is \( u = 2 \).