$$\frac { m ^ { 3 } - 3 m ^ { 2 } n } { 3 m ^ { 2 } n - 3 m ^ { 3 } }$$
$\frac{m-3n}{3\left(n-m\right)}$
$$\frac{\left(m-3n\right)m^{2}}{3\left(-m+n\right)m^{2}}$$
$$\frac{m-3n}{3\left(-m+n\right)}$$
$$\frac{m-3n}{-3m+3n}$$
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$-\frac{3n-m}{3\left(n-m\right)}$
