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Show that lines. (x-a+d)/( alpha- delt...

Show that lines.
`(x-a+d)/( alpha- delta)=(y-a)/( alpha)=(z-a-d)/( alpha+ delta) and (x-b+c)/( beta- lambda)=(y-b)/(beta)=(z-b-c)/( beta + lambda) ` are coplanar.

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