$$\left. \begin{array} { l } { 8 n + 7 = 31 } \\ { - 7 } \end{array} \right.$$
$o=-7$
$$8n=31-7$$
$$8n=24$$
$$n=\frac{24}{8}$$
$$n=3$$
$$n=3$$ $$o=-7$$
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