While there is no single "official" GDZ portal for Dudnikov as there is for standard school textbooks (like those by Goltsova or Rozental), solutions can often be found through the following platforms:
Roots, suffixes, and how words are built. gdz po russkomu jazyku dudnikov
Meaning of words, synonyms, and idioms.
Various styles of speech (formal, scientific, colloquial). How to Find Specific Solutions While there is no single "official" GDZ portal
