(x+5y)(x-7y-1)

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(x+5y)(x-7y-1)
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(x+5y)(x-7y-1)
(x+5y)(x-7y-1)

(x+5y)(x-7y-1)
(x+5y)(x-7y-1)=x²-7xy-x+5xy-35y²-5y=x²-2xy-35y²-x-5y