If you're looking for solutions for the 7th-grade algebra textbook by A.G. Mordkovich and colleagues (Alexandrova, Mishustina, Tulchinskaya), there are several reliable online resources where you can find step-by-step answers. These "GDZ" (Ready Homework) sites are helpful for checking your work or understanding complex topics like linear functions or polynomials.
and MegaResheba are also popular community-vetted sites that offer digital versions of the problem book (Zadachnik) for quick reference. gdz po algebre avtoryf.g, mordkovich i t.d.7 klass onlain
provides detailed solutions for the 7th-grade Algebra textbook by Mordkovich (Parts 1 & 2) , covering editions from 2009–2013. If you're looking for solutions for the 7th-grade
ГДЗ по алгебре 7 класс Мордкович, Учебник (Часть 1, 2) Учебник (Часть 1