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2014-05-12T22:16:41+03:00
A/b=3/7
7a=3b
a=3b/7

2a+3b=2700
2*3b/7 +3b=2700
6b/7 +3b=2700   aducem la acelasi numitor
6b+21b=18 900
27b=18 900
b=700
a=3*700/7= 3*100=300
4 3 4