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If $f(x) = 3(x-2)$ and $g(x) = 3x-12$, which of the following expresses $f(x)$ in terms of $g(x)$?

$f(x) = g(x-6)$

$f(x) = g(x+6)$

$f(x) = g(x-2)$

$f(x) = g(x+2)$

$f(x) = g(x) - 6$