7+3=10 is the behaviour."Behavior" does not solve the mystery of 7 + 3 = 10 having a seemingly dual existence. Here's my problem put differently: if we were to somehow isolate the function in the brain that is responsible for the thought of 7 + 3 = 10, surely we would see something completely different from 7 + 3 = 10, and surely the function in the brain is not the same thing as 7 + 3 = 10.
Okay, then can you explain how 7 + 3 = 10 can have two behaviors? One behavior is 7 + 3 = 10, and the other would be a process in the brain.
Your brain is a very complex process, 7+3=10 is just one of its behaviours.