A charge of -4.3 micro-coulombs, a charge of +4.3 micro-coulombs, and another unknown charge is placed inside a closed surface. The net flux through the surface of -4.8 x 106 N m2/C. The unknown charge is then placed at x = +0.69 m, y = -0.19 m. What is the x component of the electric field produced by this charge at the origin in 105 N/C?