Factorise the following:
5xy + 7y - 5y2 - 7x
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Rearranging the terms:
= 5xy - 7x + 7y - 5y2
= x(5y - 7) - y(5y - 7)
= (x - y)(5y - 7)
Hence, 5xy + 7y - 5y2 - 7x = (x - y)(5y - 7).
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