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2014-08-25T21:00:10+08:00

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It is impossible since the absolute value of any number subtracted by its opposite is a multiple of 9 because if
ab-ba= 50
ab=50+ba
If we focus on the ones digit then it would be
b=0+a or b=a which makes it impossible since if we focus on the tens
a=5+b but from the ones it means a=5+a which is wrong


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