How to use the law of universal gravitation to deduce the formula of celestial body density

The law of gravitation is (GMM) / (R ^ 2) = mg, (GM) = (GR ^ 2), M = 4 / 3 π R ^ 3 times density, so (4 / 3 π GR ^ 3 times density) / R ^ 2 = G
So the density is (3G) / (4 π RG)

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