Resources like YouTube provide video solutions for Control Work №3, Variant 1, and other specific variants.
For targeted answers to control works (контрольные работы), you can search for the authors of your specific didactic material: Resources like YouTube provide video solutions for Control
Sites like Byju's list standard problems for practice, including equations like Core Topics by Grade Level Resources like YouTube provide video solutions for Control
Detailed solutions for обучающие работы (training works) from Prosveshchenie are often available for specific sections like O-3 №4. Resources like YouTube provide video solutions for Control