(2х-у)(у+4х)+2х(у-3х)= 2ху+8х^2-у^2-4ху+2ху-6х^2=2х^2-у^2
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(2х-у)(у+4х)+2х(у-3х)= 2ху+8х^2-у^2-4ху+2ху-6х^2=2х^2-у^2
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