The masses and coordinates of three spheres are as follows: $30kg,x=2\mathrm{.}0m,y=0m$;$20kg,x=-2\mathrm{.}0m,y=0m$;$190kg,x=0m,y=1\mathrm{.}5m.$ What is the magnitude of the gravitational force on a $78kg$ sphere located at the origin due to the other spheres?

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