$$u _ { n } = 2 n - 3$$
$n=\frac{u_{n}+3}{2}$
$$2n-3=u_{n}$$
$$2n=u_{n}+3$$
$$\frac{2n}{2}=\frac{u_{n}+3}{2}$$
$$n=\frac{u_{n}+3}{2}$$
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$u_{n}=2n-3$
