$$\left. \begin{array} { l } { 12 + 8 m = 5 m - 3 } \end{array} \right.$$
$m=-5$
$$12+8m-5m=-3$$
$$12+3m=-3$$
$$3m=-3-12$$
$$3m=-15$$
$$m=\frac{-15}{3}$$
$$m=-5$$
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