Ответ:
7x+(5x-(4x+y))=7x+(5x-3x-y)=7x+5x-3x-y=9x-y
7х+(5х-3х-у)=7х+(2х-у)=7х+2х-у=9х-у
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Ответ:
7x+(5x-(4x+y))=7x+(5x-3x-y)=7x+5x-3x-y=9x-y
Ответ:
7х+(5х-3х-у)=7х+(2х-у)=7х+2х-у=9х-у