I have a question to the following derivation of the fundamental matrix by Hartley and Zisserman in "Multiple View Geometry in computer vision" (Link, page 5):

Why is it possible to do the very last transformation step? What's the trick here?
I have a question to the following derivation of the fundamental matrix by Hartley and Zisserman in "Multiple View Geometry in computer vision" (Link, page 5):

Why is it possible to do the very last transformation step? What's the trick here?
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