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2014-09-22T08:09:05+03:00
A+b+c=49
b=a-7,a=b+7
b=c+3,c=b-3
b+7+b+b-3=49
3b=45
b=15
a=b+7
a=15+7=22
c=b-3=15-3=12
22+15+12=49