y''' - 2y'' + y' = 2 - 24e^t + 40e^(5t), y(0) = 1, y'(0) = 0, y''(0) = -1y''' - 2y'' + y' = 2 - 24e^t + 40e^(5t), y(0) = 1, y'(0) = 0, y''(0) = -1

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