Often used for more difficult, specialized math problems common in Vilenkin's advanced curricula.
Vilenkin’s curriculum is known for its deep theoretical approach. GDZ for these books usually includes detailed explanations of proofs and theorems, rather than just final numerical answers. gdz po algebre klass, avtor n.ia.vilenkin
While is famous for his 5th and 6th-grade mathematics textbooks, his Algebra series for grades 7-9 (co-authored with A. N. Vilenkin, G. S. Survillom, and others) is less common than the standard Makarychev or Mordkovich versions. Often used for more difficult, specialized math problems