Odpowiedzi

2009-12-11T16:22:47+01:00
X+y+2=3
x-y-z=1
x+y-z=-1

x+y=1
x=1-y

1-y+y-z=-1
-z=-2
z=2

1-y-y-2=1
-2y=2
y=-1

x-1+2=3
x=2