Solve (x-2y)^7 - ScanMath

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Question

Simplify the expression

x^{7} - 14 x^{6} y + 84 x^{5} y^{2} - 280 x^{4} y^{3} + 560 x^{3} y^{4} - 672 x^{2} y^{5} + 448 x y^{6} - 128 y^{7}

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