7A rooms are on Decks 5, 6, 7, 8 and 9. So if you get 7A and aren't upgraded, then you'll be on one of those decks.
The numbers lanejudy posted (5524, 5024, 5180, 5188, 5680, 5688, 6178, 6678, 7520, 7022, 7170, 7182, 7668, 7680, 8520, 8022, 8662, 8674, 8164, 8176, 9012, 9512, 9152, 9164, 9652, 96640) look right. So it's likely you'll be in one of those rooms!
If you get a 7A room, your room will most likely have a verandah with an obscured view, but there is also a chance you could get a room with an undersized verandah.
We booked 7A GTY on the Fantasy and were given room 5688. (Rooms are the same on the Dream) We had one of those "undersized verandah" rooms!
Here are some photos of our verandah:
Even though our verandah was small, the views we had were amazing!!!