Excel:

Two point masses, Ma $=44000$ kg and Mb $=97000$ kg$,$ lie along the x$-$axis, with Ma at x $=-5$ m and Mb at x $=10$ m$.$ Another point mass, Mc $=36000$ kg$,$ is moved along the x$-$axis from x $=-14\mathrm{.}1$ m to x $=-5\mathrm{.}3$ m$,$ and then from x $=-4\mathrm{.}7$ m to x $=9\mathrm{.}7$ m$,$ and finally from x $=10\mathrm{.}3$ m to x $=18\mathrm{.}1$ m$,$ using a step size of $0\mathrm{.}1$ m$.$ Plot a graph of the net gravitational force on Mc $($due to Ma and Mb$)$ versus x$.$ At what point along the x$-$axis $($in other words, between which two of your x values$)$ is the net gravitational force on Mc equal to $0$ N$?$ Is this point closer to Ma or to Mb $($or is it halfway in$-$between$)?$

NOTE: We do not $$count$$ the places the graph crosses $0$ N at the locations of Ma and Mb$,$ since you can$$t actually put the center of mass of Mc at these locations.