Hello, kingsolomonsgrave!
I let (x+1)=x and (x-3)=y. . Don't do that!
Use two "new" variables: .
and I got
where do I go from here?
You can cancel the x's . . . and back-substitute.
We have: .
Factor: .
Reduce: .
Simplify: .
Where did this problem come from?
If it came from an application of the Quotient Rule,
. . something is drastically wrong.