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2014-11-14T21:26:40+02:00
A+a+1+a+2+a+3=278
4a+6=278
4a=278-6
4a=272
a=272:4
a=68 lei 
68+1=69 lei 
69+1=70 lei 
70 +1=71 lei 


68+69+70+71=278
3 3 3