It looks like there was a formatting issue with the function notation. Based on the structure of the equation, I assume you're referring to the function:

$f(x) = 6x + 4$

Now, you want to evaluate and simplify some expressions involving this function. Could you clarify which specific expressions you'd like to evaluate? For example, do you want to evaluate $f(x)$ at specific values of $x$, or are you looking to simplify a different kind of expression?

Feel free to provide the specific expressions you need help with!