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According to the answer X,Y has the same value i.e 12
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You are right, The main reason is:
x²-8y=4x
From here,we obtain x²-4x=8y
Then x|x²-4x and we can say x|8y hence according to the question, x|y. In the same way, y|x and we obtain,x=y. Then we can solve the equation and will get x=0 and 12. But 0 is not a positive integer. So x must be 12.
Just to let you know. You can use the “√” symbol…