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2014-06-10T13:28:25+03:00
A+b+b+c=28
b=a+2
c=a+4=>
a+2(a+2)+a+4=28;
a+2a+4+a+4=28;
4a+8=28;
4a=20;
a=5=> a=5,b=7, c=9
2 5 2