You're trying to access the first element of the first element of '(x). You can't access the first element of a symbol....
---
(+ car( (eval (car '(x)))) 2)
You're trying to add three things together here:
- The car function
- ((eval (car '(x)))), which is a roundabout way of saying (x) here
- 2
---
car x
Here you've entered two commands at once: One is "car", which evaluates to the car function, and the other is "x", which evaluates to 5. They're both printed to the console, but "arc>" is printed before each command is read, so the output looks quirky.