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Find the torque of the resultant of the ...

Find the torque of the resultant of the three forces represented by `-3 vec(i) + 6 vec(j) - 3 vec(k) , 4 vec(i) - 10 vec(j) + 12 vec(k), and 4 vec(i) + 7 vec(j)` acting at the point with position vector `8 vec(i) - 6 vec(j) - 4 vec(k)`, about the point with position vector `18 vec(i) + 3 vec(j) - 9 vec(k)`.

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