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Show that the lines (x+1)/(-3)=(y-3)/2=(...

Show that the lines `(x+1)/(-3)=(y-3)/2=(z+2)/1\ a n d\ x/1=(y-7)/(-3)=(z+7)/2` are coplanar. Also, find the equation of the plane containing them.

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