Is using multiple platform installs on one domain damaging to a websites SEO?

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New member
For example my website has three separate installations of Wordpress, one in the root directory for the main site, the second in it's own directory for my media area (video etc) and the third again in it's own directory is my website shop and shopping cart.

So I three separate wordpress installs that together make up my whole website but I need to know if this is damaging to my websites SEO, it's search engine ranking etc
 
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