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1. Is it possible to delete a link in this presentation(s) in case of google penalty?
The principle of www is that anyone can link to anyone, and it is impossible to authorize every link which references to you or to your client. The content on website is created by our users and comes from publicly available sources. If your site is accessible for indexing by search engine Bing, your link could appear in search results on site too.
Every link from is “no follow”, so it should NOT influence the Google Page rank. We are sorry, but we are not able to trace every link to your pages.

2. Is it possible to delete this presentation? I have already deleted it from publicly available sources (slideshare/authorstream).
Yes, we can delete your presentation(s) if it has been deleted from a publicly available source.