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**1. Homework Statement**

I am given this equation:

where m and M are masses.

I have to obtain the following as a final result:

**2. Homework Equations**

**3. The Attempt at a Solution**

so far, I have done this (This may not be the most efficient or the easiest way, but it is how my professor wants it to be done)

I am stuck at what to do for the part where I wrote {steps}