Nemeth: (no UEB)

Question – if you had:

1. Subtract ab from both sides.  Would you  have ab with a letter indicator in front of the a?
2. How can you isolate w?  Would the w have a letter sign or no?
3.  You can rewrite the right side as two terms, c = x−a−ab−a,…. etc.  Is there a letter sign in front of the c or no?

I know this is probably a basic question but I just want solid clarification on it.  I think I find an answer but then I’m not sure.  Thank you!