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 99x+101y=1499 -----(1)101x+99y=1501------(2)Multiply (1) by 101 ---> 9999x+ 10201y = 151399
multiply (2) by 99 -----> 9999x + 9801y = 148599
solving them we get....400y is 2800
y is 7
substituting y in (1)
99x + 707 = 1499
99x = 792
x is 8

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See you can do it with substitution method also
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