X+Y=6456
X=5Y
5Y+Y=6456
6Y=6456
Y=6456/6
Y=1076, acum nu ne ramane decat sa inlocuim pe Y cu valoarea obtinuta in prima suma:
X+1076=6456
X=6456-1076
X=5380
Proba: 5380+1076=6456
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X+Y=6456
X=5Y
5Y+Y=6456
6Y=6456
Y=6456/6
Y=1076, acum nu ne ramane decat sa inlocuim pe Y cu valoarea obtinuta in prima suma:
X+1076=6456
X=6456-1076
X=5380
Proba: 5380+1076=6456