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2014-05-02T19:22:18+03:00
A+b+c=18
b-3=a
b+3=c

b-3+b+b+3=18
3b=18
b=6
a=6-3=3
c=6+3=9
1 5 1
2014-05-02T19:23:11+03:00
A+b+c=18
b=a+3
c=b+3 
c=a+6
a+a+3+a+6=18
3a=9
a=3
b=6
c=9
1 5 1