Since this is a very common textbook in Russia, you can find free, step-by-step solutions on several reliable platforms. Here are the most popular ones:
: Great for quick access on mobile. It often includes video explanations for the more difficult proofs and construction problems. gdz po geometrii klass pozniak iudina atanasian besplatno
: Provides multiple solution options for the same problem, which is helpful if the first explanation doesn't quite click. Since this is a very common textbook in
When using these, just make sure you select the correct from the table of contents, as the textbook has been updated over the years and numbering can occasionally shift. : Provides multiple solution options for the same
It sounds like you're looking for a (solution manual) for the 7th-9th grade Geometry textbook by Atanasyan, Butuzov, Kadomtsev, Poznyak, and Yudina .
: Likely the most comprehensive site. It includes scanned handwritten solutions and typed versions for almost every exercise in the book.