Ze wzoru wyznacz z.
x-y=1\3 z |*3
3(x-y)=z
z=3x-3y
x=y+1/3z |*3
3x=3y+z
3x-3y= z
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x-y=1\3 z |*3
3(x-y)=z
z=3x-3y
x=y+1/3z |*3
3x=3y+z
3x-3y= z