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Q 1835401362.     Find the values of `p` so that the lines
`(1 - x)/3 = ( 7y - 14)/(2p) = ( z - 3)/2` and
` (7 -7x)/(3p) = ( y - 5)/1 = ( 6 - z) /5` are at right angles.
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)