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If the straight lines (x-1)/(2)=(y+1)/(l...

If the straight lines `(x-1)/(2)=(y+1)/(lamda)=(z)/(2)and(x+1)/(5)=(y+1)/(2)=(z)/(lamda)` are coplanar, find `lamda` and equations of the planes containing theses two lines.

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The correct Answer is:
`x+y+1=0`
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