Won't do much
Connecting a Nexus 7 to a Kindle will not do much, if anything. Even if it did you would not be able to use most of the kindle content on the Nexus 7 due to copy protection (DRM).
If you want your kindle content on the Nexus 7 install the Kindle app from the Google Play store on the Nexus 7 and get the Books, etc. from your library using the Kindle app.
I wouldn't bother trying it.
kees
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