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Suppose that three astronomical objects (1, 2, and 3) are observed to lie on a line,...

Suppose that three astronomical objects (1, 2, and 3) are observed to lie on a line, and that the distance from object 1 to object 3 is D.

Given that object 1 has four times the mass of object 3 and seven times the mass of object 2, find the distance between objects 1 and 2 for which the net force on object 2 is zero.

d12 / D = __ ?

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