Engineering mechanics 1, Exercise 10 - Calculate the resulting force and moment, 3D

The forces F1, F2 and F3 act on a frame as shown. The acting forces have to be summarized in point A and point B. How big are the resulting force and the resulting moment?
This exercise can be found here: pickedshares.c...
Calculation of moment vectors using the cross product (Sarrus rule). An exercise for the calculation of spatial or three-dimensional problems.