Evaluate
-\left(m+n\right)^{13}
Expand
-\left(m^{13}+1716m^{6}n^{7}+1287m^{5}n^{8}+715m^{4}n^{9}+286m^{3}n^{10}+78m^{2}n^{11}+13mn^{12}+n^{13}+1716n^{6}m^{7}+1287n^{5}m^{8}+715n^{4}m^{9}+286n^{3}m^{10}+78n^{2}m^{11}+13nm^{12}\right)
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