solve t^7 - 4 t^6 - 9 t^5 + 28 t^4 - 5 t^3 - 28 t^2 + 5 t + 4=0solve t^7 - 4 t^6 - 9 t^5 + 28 t^4 - 5 t^3 - 28 t^2 + 5 t + 4=0

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