$$\frac{2m+5}{3}=3m-10$$
$m=5$
$$2m+5=9m-30$$
$$2m+5-9m=-30$$
$$-7m+5=-30$$
$$-7m=-30-5$$
$$-7m=-35$$
$$m=\frac{-35}{-7}$$
$$m=5$$
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