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2014-10-17T17:57:14+03:00
X-y=25
3x+y=375
                adunam
4x=400
x=100
100-y=25
y=75

6 3 6
2014-10-17T17:57:45+03:00
A-b=25
3a+b=375
aduni cele doua ecuatii si obtii 4a=400=>a=100 si b=75
3 4 3