I drew the equation of the plane: x-y-z+1=0but I think your program is wrong.
I have attached the image.
It's OK. Note that you can easily mess up with the axxes by dragging the 3D view. Show the labels of the axes in the settings of the 3D view to avoid this. Red is x, green is y and blue is z.As an extra control, create points with given coordinates to check it and you 'll notice they match.
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