Look for "Gdz" (ГДЗ) or "Book for Parents" (Книга для родителей) which contains all the answers to the exercises in the workbook and textbook. Specific Materials: Student's Book (SB): The main textbook answers. Workbook (WB): Practice exercise answers.
Most reliable "Reshebniks" are shared in PDF format for easy reading on tablets and phones. Look for "Gdz" (ГДЗ) or "Book for Parents"
I.N. Vereshchagina, K.A. Bondarenko, and T.A. Pritykina. and T.A. Pritykina.