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2014-01-07T19:23:38+02:00
A+b+c=81
a/b=4⇒a=4b
c/b=2 rest 4⇒c=2b+4
4b+b+2b+4=81
7b=81-4
7b=77⇒b=11
a=4*11=44
c=2*11+4=22+4=26
verificare: 44+11+26=81