You can access the solutions and explanations through these platforms:
provides detailed solutions for the 7th-grade Algebra textbook by Mordkovich (Parts 1 & 2) , covering editions from 2009–2013. gdz po algebre avtoryf.g, mordkovich i t.d.7 klass onlain
Using these tools is most effective when you try to solve the problem yourself first and then use the online resource to find where you might have made a mistake. You can access the solutions and explanations through