Let $f$ be defined by $f(x) = x-3x^{2}-3$, and let $a$ be any constant.

$f( a ) =$ and

$f'( a ) =$ .

An equation for the tangent line to $y = f(x)$ at $x = a$ is

$y =$ .

(This answer will depend on the variable $x$ and the constant $a$.)