physics/calculus

I need help in calculating work.
following quantites are given.
* G: 6.67E-11
*Mass of earth:5.98E24
*mass of satelightt:80kg
*x(initial) center of the earth-7E6 m
*x(final) center of the earth 12E6 m
How do I make integral equation I need use 20 interval.

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