$$\frac{ 42 { n }^{ 4 } }{ { m }^{ 5 } } \times \frac{ m }{ 14 { n }^{ 4 } } =$$
$\frac{3}{m^{4}}$
$$\frac{42n^{4}m}{m^{5}\times 14n^{4}}$$
$$\frac{3}{m^{4}}$$
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$-\frac{12}{m^{5}}$
