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2014-03-31T21:48:14+03:00
A+b+c=902
b+c=15+a+b
c=3b

b+c=15+a+b
b+3b=15+a+b
4b=15+a+b  /-b
3b=15+a

a+b+c=902 /x3
3a+3b+3c= 2706
3a+15+a+3x3b=2706
3a+15+a+45+3a=2706
7a+60=2706
7a= 2646
a=378

3b=378+15
3b=393
b=131

c=3x131
c=393