: A massive database of school solutions that covers almost every edition of the Kuzovlev series. It’s a "gold standard" for reliability.

The Kuzovlev series is a staple in Russian schools but is known for its (often requiring students to jump between the textbook, workbook, and reader).

Always check the year of publication on your textbook cover. There have been several revisions of the Kuzovlev curriculum (e.g., 2013 vs. 2021), and exercise numbers sometimes shift between editions.