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We can find  a parametric representation for the 3-dimensional straight line AB where
       A(-7, 6, 3)  and  B(7, -6, -3)

let t be a real valued parameter.

  x = x1 + (x2 - x1) t =  -7 + 14 t
  y = y1 + (y2 - y1) t =  6 -12 t
  z = z1 + (z2 - z1) t  =  3 - 6 t

7 4 7
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