Given g(x)=1/(x-3) and h(x)=1/(x^2-9), find the equation of (g/h)(x) and state its domain and range.?

Given g(x)=1/(x-3) and h(x)=1/(x^2-9), find the equation of (g/h)(x) and state its domain and range.
I don't remember how to do these types of questions!
please help!
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