If you are looking for the actual books that these solutions are based on, these are the most prominent in the Russian-speaking segment:
Here is a deep dive into the world of algebra problem collections and the "answers" that follow them. 1. The Anatomy of a Classic: Kuznetsova’s Collection gotovye domashnie zadaniia algebra sbornik zadanii
With heavy workloads, students often use GDZ to speed up "routine" tasks to focus on more complex subjects or extracurriculars. 3. The Ethical and Cognitive Dilemma If you are looking for the actual books