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Find the torque of the resultant of the ...

Find the torque of the resultant of the three forces represented by `-3hat(i)+6hat(j)-3hat(k),4hat(i)-10hat(j)+12hat(k)and4hat(i)+7hat(j)` acting at the point with position vector `8hat(i)-6hat(j)-4hat(k),` about the point with position vector `18hat(i)-3hat(j)-9hat(k).`

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