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X+2y=17
Y-3z=4
2x+5y-3z
Dau coroana repedeeee


Răspuns :

Răspuns:

X+2y=17 I·2 => 2x+4y=34

Y-3z=4

2x+5y-3z=2x+4y+(y-3z)=2x+4y+y-3z=2x+5y-3z=34+4=38