Several high-quality platforms offer verified answers for different editions of Mordkovich's algebra curriculum:
Finding solutions for Alexander Mordkovich's algebra textbooks (commonly referred to as GDZ in Russian-speaking regions) is easy if you know where to look. These resources provide step-by-step breakdowns for all grade levels, from grade 7 through 11. Best Online Platforms for Mordkovich Solutions
Solving Problems In Algebra And Trigonometry : V. Litvinenko