7x-2y=5xy 8x+7y=15xy by cross multiple method
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7x-2y= 5xy multilply it by 7 --1
8x+7y=15xy multiply it by 2 --2 and 1 and 2
49x-14y=35xy + 16x+14y=30xy
65x=65xy === y=1 and x=1
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