Ricardo, duplicate content is not permitted on HubPages, even if it is your own work. The content only need be substantially similar in order for the hub to be considered as containing duplicate content. The same thing happened to me when I published a hub that contained a significant similarity to an Op-Ed I wrote for the Gainesville Sun.
You will have to re-write/revise your hub and then submit it for publication once again so that the staff can review it.
One of our fellow hubbers wrote a hub on this issue. You can read "How to Handle a Duplicate Content Warning on HubPages" by Deborah Neyens at the following URL: https://hubpages.com/community/How-to-Handle-a-Dup...
Wishing you much success here on HubPages.