$$7(n-3)=8$$
$n = \frac{29}{7} = 4\frac{1}{7} \approx 4.142857143$
$$n-3=\frac{8}{7}$$
$$n=\frac{8}{7}+3$$
$$n=\frac{8}{7}+\frac{21}{7}$$
$$n=\frac{8+21}{7}$$
$$n=\frac{29}{7}$$
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