#### Answer

\[x=\frac{bc}{ad}\].

#### Work Step by Step

Simplify the provided expression as follows:
\[\begin{align}
& \frac{ax-b}{b}=\frac{c-d}{d} \\
& \frac{ax}{b}-\frac{b}{b}=\frac{c}{d}-\frac{d}{d} \\
& \frac{ax}{b}-1=\frac{c}{d}-1 \\
\end{align}\]
This can be further simplified as:
\[\begin{align}
& \frac{ax}{b}=\frac{c}{d}+1-1 \\
& \frac{ax}{b}=\frac{c}{d} \\
& x=\frac{bc}{ad} \\
\end{align}\]
The solution for the provide proportion is\[x=\frac{bc}{ad}\].