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A point charge of +5.0 μC is located at x = -3.0 cm, and a second...

A point charge of +5.0 μC is located at x = -3.0 cm, and a second point charge of -8.0 C is located at x = +4.0 cm. Where should a third charge of +6.0 μC be placed so that the electric field at x = 0 is zero ?

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