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2014-03-14T17:38:43+02:00
A:b=3-->a=3b c:a=2-->c=2a--->2a=6b 3b+b+6b=420--> 10b=420---> b=42 a:42=3---> a= 126 c:126=2-->c=252 Proba: 126+42+252= 420 deci e corect :D