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... senem Augustum devinxerat adeo, uti nepotem unicum Agrippam Postumum,...

this is not adeo, adire, but adeo 'so,' 'to such a degree,' and is follow by a result clause introduced by 'uti.' Nam senem Augustum devinxerat adeo, uti....proiecerit, 'for she [Livia] had shackled the old man Augustus to such a degree that he deported his only grandson Agrippa Postumus.