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Question

Solve :
7x2yxy=5
8x+7yxy=15

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Solution

7x2yxy=57y2x=5(1)
8x+7yxy=158y+7x=15(2)
(1)×749y14x=35(3)
(2)×216y14x=30(4)
(3)+(4)65y=65y=1
Put y=1 in (1)
712x=52x=2x=1

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