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x+y=z
-x+y-z=6 za z wstawiam x+y :-x+y-x-y=6 ; -2x=6 ;x=-3
z+z=-y
teraz do pierwszego za x wstawiam -3
-3*y=-6/:(-3)
y=2
wstawiam do drugiego: -3+2=z ; z=-1
x=-3
y=2
z=-1