Ответ:
x+y/3
Объяснение:
7(x-y)(x+y)/21(x-y)
(x-y)(x+y)/3(x-y)
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Ответ:
x+y/3
Объяснение:
7(x-y)(x+y)/21(x-y)
(x-y)(x+y)/3(x-y)
x+y/3