In the figure, the magnitude of vector A with rightwards harpoon with barb upwards on top is 17.8 units, and the magnitude of vector B with rightwards harpoon with barb upwards on top is 11.6 units. What vector C with rightwards harpoon with barb upwards on top must be added to the vectors A with rightwards harpoon with barb upwards on top and B with rightwards harpoon with barb upwards on top so that the resultant of these three vectors points in the -x direction and has a magnitude of 7.8 units?
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