Evaluate
-\left(a-b\right)^{8}\left(\left(ab\right)^{5}+\left(a-b\right)^{5}\right)
Expand
56a^{8}b^{10}-28a^{7}b^{11}+8a^{6}b^{12}-a^{5}b^{13}+56b^{8}a^{10}-28b^{7}a^{11}+8b^{6}a^{12}-b^{5}a^{13}-a^{13}+1716a^{6}b^{7}-1287a^{5}b^{8}+715a^{4}b^{9}-286a^{3}b^{10}+78a^{2}b^{11}-13ab^{12}+b^{13}-1716b^{6}a^{7}+1287b^{5}a^{8}-715b^{4}a^{9}+286b^{3}a^{10}-78b^{2}a^{11}+13ba^{12}-70\left(ab\right)^{9}
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