Answer
These are an action-reaction pair, and Newton's third law tells us these forces have the same magnitude.
$$ G \frac{M m}{d^{2}} = G \frac{m M}{d^{2}} $$
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 Explain - Page 179-180: 56
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