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Prove that the plane ax+by+cz+d=0 divide...

Prove that the plane `ax+by+cz+d=0` divides the line-segment joining the points `A(x_(1),y_(1),z_(1))` and `B(x_(2),y_(2),z_(2))` in the ratio `-(ax_(1)+by_(1)+cz_(1)+d)/(ax_(2)+by_(2)+cz_(2)+d)`.

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