$$a _ { n } = 12 - 3 n$$
$n=-\frac{a_{n}}{3}+4$
$$12-3n=a_{n}$$
$$-3n=a_{n}-12$$
$$\frac{-3n}{-3}=\frac{a_{n}-12}{-3}$$
$$n=\frac{a_{n}-12}{-3}$$
$$n=-\frac{a_{n}}{3}+4$$
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$a_{n}=12-3n$
