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x-2y+z=4 -2x+5y-2z=-2 x-y+3z=2


Răspuns :

x-2y+z=4 -2x+5y-2z=-2 x-y+3z=2
x-2y+z+2x-5y+2z+2x+y-3z=2
6x-8y=2|:2
3x-4y=1
3x=1+4y
x=1/3+4y/3  ___