Website Technical issue

[shwetapandey0]

I have two website http://domain.ninexcel.com and http://www.ninexcel.com/. Both website have same content and same templates but I want to promote this domain
http://domain.ninexcel.com. How to resolve same duplicate issues and how to promote this. Currently this domain not showing on Google SERP.

[Webhelpforums]

If you won't redirect, you could possibly use canonical tag to point search engines to what you consider the real/best domain for he content