1. Simplify

First, add the fractions on top. Find common denominators:

Multiply out the second fraction on top.

Add the tops on the top.

The top simplifies to

We are now ready to invert and multiply.

Cancel

which simplifies to

Note that we could go straight from

to the answer.

Cancel out the things that would cancel if you inverted and

multiplied.

and the only thing that is left is the B in the top.