Algebra practice questions help

I’m really bad at this topic, and I need help trying to solve these questions. I tried on my own but I get lost, and was hoping for someone to help me, and learn. Thank you. Show your work if you can 😀 It’s about equations.

There is 21 questions, and there are extra pages to show your work after questions 17-21.

Thank you very much, Again, I do not want to cheat at all, I just need help. My parents can’t help me and I do not have access to my teachers so I hope you can show your work. Thank you so much!