18xy(49x2_64y2)/9xy(7x+8y)
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Answer:
18xy(49x^2-64y^2)/9xy(7x+8y)
=2{(7x)^2-(8y)^2}/(7x+8y)
=2(7x+8y)(7x-8y)/(7x+8y)
=2(7x-8y)
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