Answer:

Explanation:
Let's first multiply both sides by m to get rid of the denominator.

Now, we have an a on both sides of the equation. It will be easier to solve if there is only one, so let's divide both sides by a.

The 1 on the right can be moved to the left to isolate the fraction.

We want to get a by itself, so let's multiply it on both sides to remove it from the denominator.

Finally, we can divide zm-1 from both sides to get a by itself.
