p(2+x)-p(3a-x

To simplify the expression \( p(2+x) - p(3a-x) \), we need to know more about the function \( p \). Without additional context or knowing the form of \( p \), we can only express the difference as it is.

If \( p \) is a polynomial or any other specific type of function, we could carry out the operation more explicitly if we know the degree or specific terms of \( p \).

If you provide more information about the function \( p \), I'd be happy to help further!