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self install question

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self install question

Probably simple solution but I'm no techie, so I'm a bit confused.

Received self-install kit for home internet. Detailed directions were promised but not included in the package.  I received an xFi Gateway, power coard, coax and ethernet cables. That's it. I already have comcast cable, with a standard cable box.

I assume its coax from wall outlet to the Gateway. How do I connect in the TV and cable? Is it ethernet from Gateway to TV or to TV box.  If the later, then how does it go from TV box to the TV itself?