If f(x) = 7x − 1, what does f(12) represent?

The value of x when (7x − 1) = 12
The value of (7x − 1) when x = 12
The value of 12 f(x) when x = 12 <-- My answer
The value of f(x) when (7x − 1) = 12 ((What I think it is...))