Evaluate
\left(2x-5y\right)^{9}
Expand
512x^{9}-6300000x^{4}y^{5}+10500000x^{3}y^{6}-11250000x^{2}y^{7}+7031250xy^{8}-1953125y^{9}+2520000y^{4}x^{5}-672000y^{3}x^{6}+115200y^{2}x^{7}-11520yx^{8}
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