Объяснение:
7xy-x²-x+7y = 7xy +7y -x² -x = 7y(x+1) - x(x+1) = (7y-x)(x+1)
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Объяснение:
7xy-x²-x+7y = 7xy +7y -x² -x = 7y(x+1) - x(x+1) = (7y-x)(x+1)