a-a

_

a - a

_

b

not sure if that makes sense like that but im not entirely sure how to write it, basically a take away a over a take away a over b, simplified.

Would I be right to make the last part

a a

_-_

1 b

so it turns into 1-b because the top parts cancel each other out, so I'm left with a-a

_

1-b?

Or is that completely on the wrong track?