What is the undefined value for 22=4+5x/9x−6

To find the undefined value for the equation \( 22 = \frac{4 + 5x}{9x - 6} \), we need to determine when the denominator is equal to zero, as this would make the expression undefined.

The denominator is:

\[
9x - 6
\]

Setting the denominator equal to zero:

\[
9x - 6 = 0
\]

Solving for \( x \):

\[
9x = 6
\]
\[
x = \frac{6}{9} = \frac{2}{3}
\]

Thus, the undefined value is:

\[
\frac{2}{3}
\]

So the answer is:

\[
\text{The undefined value is } \frac{2}{3}.
\]