Comprehensive descriptions and chapters are available at the Public Library of N.Ya. Vilenkin .

Focus on the step-by-step reasoning provided in the solutions. Understanding the underlying ideas is more important than the final answer.

Алгебра, 9-класс, Н.Я.Виленкин, Г.С.Сурвилло, А ... - AnyFlip

— Deep dive into functional dependencies.

— Includes advanced methods for solving rational equations. Chapter XI: Sequences — Progressions and limits.

Алгебра, 9-класс, Н.Я.Виленкин, Г.С.Сурвилло, А.С.Симонов, А.И.Кудрявцев, 1998г.