can you rotate two edges symetrically without mirror modifier? For example, if I have two edges like these:

and when I rotate them, I want them to rotate in opposite directions, like when you use the mirror modifier so that it looks ike this:


I was wondering if there's a way to do this without the mirror modifier because sometimes I just want to select two edges or faces in a mesh and either translate or rotate them symmetrically.
At the top bar, use your mouse to scroll over , far right.. your top bar will show XYZ buttons near the end. Depending on the object's origin, select X while you're on edit mode. You should get desired results.