Number of coaxial cable runs for TV and Internet

Hello,I currently have Xfinity internet into my home. A single coax cable runs into my home through the conduit that was installed when the home was built. If I were to add Xfinity TV service with 3 rooms total, could I do it without needing to run another coax cable and utilizing the existing run? Can 1 coaxial cable run service both TV and Internet? I want to avoid having to run another cable from the outside of the house. The way the conduit was run makes it very difficult to tap into and I want to avoid making a hole on the side of the house. 

As a non-technical person, I have noticed that most responses to the question about cable and internet being carried through the same coaxial cable fail to mention that the coax cable to use should be RG-6 when connecting to a cable modem.  I think most technical folks assume that's the cable in use, but I noticed that my Xfinity coaxial internet connection cable (installed many years ago) was slightly different than the cable they used to go from the other outlets to the TV cable boxes.  Upon further research, I found that the TV coax was RG-59 and would not support the internet signal being transmitted to a cable modem, only the RG-6 would work.  RG-6 is not expensive, just slightly more than RG-59, but if you're trying to move a modem and wireless router to another room and it doesn't work, that's probably the problem.

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