The first link didn't lead to a PDF of answers. Instead, it led to an old, archived forum from 2004. The top post was titled: It claimed that if you stared at the answer key long enough without actually learning the logic, the grammar would begin to change your reality. Nikolai laughed, found a different site, and quickly copied the answers for Exercise 5b.
The search query "uprazhneniia po grammatike nemetskogo iazyka narustrang gdz" translates to "German grammar exercises by Narustrang GDZ" (GDZ refers to "Gotovye Domashnie Zadaniya" or "Ready-made Homework Answers"). uprazhneniia po grammatike nemetskogo iazyka narustrang gdz
Here is a detailed story centered around a student navigating the world of German grammar through this specific book. The Grammar Ghost of Room 402 The first link didn't lead to a PDF of answers