This site often hosts PDF excerpts of test books (like those by Grishina or other authors) which are similar in structure to Voronina's GIA tests. You can view sample rational fraction tests to compare solutions. Common Topics Covered in 8th Grade GIA Algebra
Simplifying fractions, addition, subtraction, and multiplication of rational expressions. reshenie gia algebra 8 klass voronina o.a
The search for a specific "write-up" or answer key for (Решение ГИА Алгебра 8 класс Воронина О.А.) suggests a request for a solution manual or study guide for a 8th-grade Algebra workbook focused on the State Final Examination (GIA) format. This site often hosts PDF excerpts of test