Number 3 can be simplified to (x+3)/(x-4)
did you read my comment.
Yes and it is equal to x-1 (as long as x≠1)
and “equal (as long as x≠1)” isn’t the same as just being equal
It is it's "root", it's "zero", and to answer your question, yes, it is not the same
then the 5 above expressions are in simplest form, QED
