Russian Math Olympiad Question

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That's very good. I am new but I understand your Questions easily.

PremLata-he
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It is good but my first time to witness it.

Why???? Maam

AFCOE
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Why negative values of pairs are supposed to be integers ?

shortesis
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What??? X=(-3) and y=(-4) not satisfying the equation??? Just x=y=12 or -12 is satisfying???

cinf