Answer
$$G \frac{(2m_{1})(2 m_{2})}{(2 d)^{2}} = G \frac{m_{1} m_{2}}{d^{2}} $$
When the distance is doubled, and the mass of each of the planets is doubled, the gravitational force is the same as it was before.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 9 - Think and Solve - Page 178: 41
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