$$- \frac{ 1 }{ 12 } { m }^{ 3 } { n }^{ 3 } \times 13 { m }^{ 4 } { n }^{ 4 }$$
$-\frac{13\left(mn\right)^{7}}{12}$
$$\left(-\frac{1}{12}\right)^{1}m^{3}n^{3}\times 13^{1}m^{4}n^{4}$$
$$\left(-\frac{1}{12}\right)^{1}\times 13^{1}m^{3}m^{4}n^{3}n^{4}$$
$$\left(-\frac{1}{12}\right)^{1}\times 13^{1}m^{3+4}n^{3+4}$$
$$\left(-\frac{1}{12}\right)^{1}\times 13^{1}m^{7}n^{3+4}$$
$$\left(-\frac{1}{12}\right)^{1}\times 13^{1}m^{7}n^{7}$$
$$-\frac{13}{12}m^{7}n^{7}$$
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$-\frac{91m^{6}n^{7}}{12}$
