Which are you trying to find the solution for?
You can sometimes find scanned copies of the textbook or the accompanying task books to cross-reference your work on academic platforms like the Internet Archive . iu.m.erokhin, gdz
for the chemistry textbooks by Yuri Mikhailovich Erokhin (Ю.М. Ерохин). Which are you trying to find the solution for
Platforms like Znanija (the Russian branch of Brainly) or Mail.ru Otvety frequently feature threads where students and tutors solve specific problems from Erokhin's collections. iu.m.erokhin, gdz