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2014-10-05T20:26:30+03:00
B=36-a
c=51-a
a+b+c=a+36-a+51-a=87-a
57=87-2a=>-2a=57-87=>-2a=-20=>a=10
b=36-10=26
c=51-10=46
c-a-b=46-10-26=10
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