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Show that the points A(-1,\ 4,\ -3),\ B(...

Show that the points `A(-1,\ 4,\ -3),\ B(3,\ 2,\ -5),\ C(-3,\ 8,\ -5)a n d\ D(-3,\ 2,\ 1)` are coplanar.

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`x+y+z=0`
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