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