Three charges are fixed to an x, y coordinate system. A charge of +18 µC is on the y axis at y = +3.0 m. A charge of -12 µC is at the origin. Lastly, a charge of +49 µC is on the x axis at x = +3.0 m. Determine the magnitude and direction of the net electrostatic force on the charge at x = +3.0 m. Specify the direction relative to the -x axis.