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Find the torque of the resultant of the ...

Find the torque of the resultant of the three forces represented by `-3hati+6hatj-3hatk, 4hati-10hatj+12hatk and 4hati+7hatj` acting at the point with position vector `8hati - 6hatj-4hatk`, about the point with position vector `18hati+3hatj-9hatk`.

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