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As per the below mentioned link, you can install and activate CC apps on two computers as mentioned under the "Can I use the software I download from Creative Cloud on multiple computers?":
So, I would suggest you to deactivate and uninstall the apps on the Mac which you are selling.
Let us know if it helps,
I uninstalled the Apps ( CS6 CC-edition and CC), but I did not need to deactivate. Before, with CS5.5 and older Apps there always was a prompt asking if I would like to deactivate. Possibly CC has another way of handling activations than older Adobe apps, which seems reasonable.