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Cel mai inteligent răspuns!
2014-05-01T17:31:36+03:00
2a+b-3c=15
a-4b+8c=25/*3
3a-12b+24c=75   
2a+b-3c=15 adunam ultimele doua relatii
5a-11b+21c=75+15=90
1 5 1