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Use expressions. Example:
mirroX=512; //mirroring axis X
mirrorY=288; //mirroring axis Y
posX=thisComp.layer("singer").transform.position; //Singer X position
posY=thisComp.layer("singer").transform.position; //Singer Y position
//--- end expression ---
Should do the trick.
another way via parenting... Parent to null, set null scale -100, 100.
I wound up making the layer into a composition and applying -100% to the scale width.
That works too... Your title is a bit misleading though... If you just wanted to mirror layer movements (position), you'd have to use Myl's technique. If you wanted to mirror their position and their orientation, you'd have to use - scale.