The search for a dedicated for the 9th-grade textbook by Korsakov, Barabashova, and Kamyshanskaia indicates that while the textbook exists, a specific online "GDZ" portal carrying its complete solution key is not widely indexed in major databases like GDZ.ru or GdzOnline.net.
Based on the curriculum for this textbook, students focus on:
In-depth study of complex sentences (compound, complex, and asyndetic).
Sentences combining different types of syntactic links. Alternative Resources