Solve (2y-z)^7 - ScanMath

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Question

Simplify the expression

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

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