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2014-10-12T17:05:15+03:00
2 (a+b+c)=42 
a+b+c = 21
a) 21x3 = 63
b) 21x5=105
c) a+b+c=42
15+c= 42
c=27
b= (daca ai invatat nr rationale negative) -14
a=-13
1 5 1