You will find PDFs behind paywalls. While these exist, they are often illegal copies of student work. Worse, the solutions are unverified. We have seen Chegg "experts" provide circular reasoning for group theory proofs.
Spend at least 30 minutes staring at a problem without writing anything. Define your terms. Restate the problem in your own words. If you still have no idea, move to Step 2. a book of abstract algebra pinter solutions
Finding comprehensive solutions for Charles C. Pinter's A Book of Abstract Algebra You will find PDFs behind paywalls
Pinter is different. He writes for the curious beginner. a book of abstract algebra pinter solutions