At time t= 0, a particle is located at the point (4,9,7). It travels in a straight line to the point (6,1,1), has speed 7 at (4,9,7) and constant acceleration 21 - 8j - 6k. Find an equation for the position vector r(t) of the particle at time t. The equation for the position vector r(t) of the particle at time t is r(t) = D i+ ()j+ () K. (Type exact answers, using radicals as needed.)

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