pre-calculus....finding domain?

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Suppose f(x)=x^2-6x and g(x)= x-6. Find each of the following and specify the domain for each.

a) f+g

b) f-g

c) f (times) g

d) f/g


I don't get how to find the domain or how to write it. I figured out how to find each but not the domain.
 
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