Reshak.ru - Specific to the 10–11 grade combined textbook with over 1,600 exercises.
Pomogalka.me - Detailed breakdowns for various grades in the Alimov curriculum. gdz klassa po algebre alimov koliagin sidorov i dr
ГДЗ по Алгебре 7 класс Алимов, Колягин учебник Решебник Reshak