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Homework Statement
Trying to run through every problem i can in my book in preparation for my exam. I've solved this one before, but it slipped my mind how to do it :
http://gyazo.com/9fcf9f3cef522c3d5eb1fa7d4ad04394
Homework Equations
Working in a group, so group axioms I suppose.
The Attempt at a Solution
I forgot where to start this one off, I was thinking :
e = aa-1
a-1e = a-1aa-1
That won't get me anywhere though, any pointers would be appreciated.