Solve for $x$. \[ (x-3) k=z \]

Step 1 ：The question is asking to solve for $x$ in the equation $(x-3)k = z$.

Step 2 ：To isolate $x$, we need to first divide both sides of the equation by $k$ to get $x-3 = \frac{z}{k}$.

Step 3 ：Then add 3 to both sides to get $x = 3 + \frac{z}{k}$.

Step 4 ：The solution to the equation is $x = 3 + \frac{z}{k}$.

Step 5 ：Final Answer: $x = \boxed{3 + \frac{z}{k}}$