Ram upgrade on toshiba satellite U840-10R

Solution
Is this your laptop (it says U840 on the keyboard deck)?

https://www.youtube.com/watch?v=6seJVKLa2Zk

The video shows 2 RAM slots, back to back.

Here is a photo as well:
maxresdefault.jpg
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Thanx for your reply, there's no empty slot, i was wondering if the empty one was under the keyboard.... i used the crucial diagnosis tool and found the same answer as you... maybe the french version of the laptop does not have two slots.