Re: finding the domain
3/3-3 = (3/3)-3 = 1-3 = -2 -- This is not particularly meaningful for a Domain Question.
3/(3-3) = 3/0 -- Whoops. I guess x = 3 is NOT in the Domain. So, the Domain is \(\displaystyle x\neq3\), or Real Numbers, excepting x = 3.