Answer:

Please look at what I assumed your equation was:
.
Step-by-step explanation:
I'm going to pretend that says:
.
Please correct me if I'm wrong.
We want to solve for M.
The very first thing I'm going to do is multiply both sides by
.

Now I'm going to divide both sides by -kn:

Simplifying:

Sometimes people don't like the negative on bottom; just move it to the center:

