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i mean, im used to having all of my documents in my document folder, and i would like that the dropbox folder that is used for the service is actually my documents folder, since all i will be using it is for documents
 
You could simply move your Dropbox folder to within your Documents folder. Do this from from Drobox preferences and not by dragging the folder.

You can also then change your Finder preferences so that new Finder windows open Dropbox instead of Documents.
 
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