1. The problem statement, all variables and given/known data Show that a+b = b+a follows from the other ring axioms. 2. Relevant equations a + 0 = 0 + a = a (?) 3. The attempt at a solution I know this is probably a simple algebraic manipulation, probably with the distributive law, but I don't know how to start! I'm sure I need some 1s and 0s somewhere. Thanks!