How Will deleting duplicate content from my website get me ranked again?
If you have received a warning in Google Webmaster tool than it will take a lot more than just some massaging but if you have not received a warning then redo all your duplicate content by adding more paragraphs and moving existing around and removing it where it makes sense.
Then add links at high PR sites and create Web 2.0 sites and blogs to support the site.
Your website may or may not regain its ranking but you should surely delete duplicate content from your website.
That's big issue to have Duplicate Content over Web pages When Website Becomes Popular . One of Better option is Update Your Content "informative as well unique " And Then Again Promote Website . Be Smart and place your targeted Keywords with in Content "Looks Natural" .
Duplicate Content is not a good thing for a website ranking anytime google can punish you so it would be better if you change your website content and never use duplicate content you can check your content before you use...
Duplicate content, is what none of Search Engine likes, so the best solution would be create unique content as per your Keywords, if any.
Creating unique and quality content, will help you attain a good position in SERP.
duplicate content harms the websites so the best solution is to create different contents for the websites...
According to panda and penguin, we don't have to use duplicate content if we use duplicate content then our sites would be penalized so you should delete duplicate content to get maximum benefit I would say.