5n+ 4 /y =9 ,7x +2/y = 5
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5x+4/y=9. 7x-2/y=5
5x+4=9y. 7x-2=5y
(5x+4=9y)7 (7x-2=5y)5
35x+28=63y. 35x-10=25y
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