\left\{ \begin{array} { l } { p = \frac { 3 } { v } } \\ { v = \frac { 4 } { 3 } \pi R ^ { 3 } } \\ { 4 M = 9 R ^ { 2 } } \end{array} \right.
Solve for p, v, R, M
p=\frac{3}{v}\text{, }v=-\frac{32\pi M^{\frac{3}{2}}}{81}\text{, }R=\frac{\sqrt[3]{\frac{6v}{\pi }}}{2}\text{, }M>0
p=\frac{3}{v}\text{, }v=\frac{32\pi M^{\frac{3}{2}}}{81}\text{, }R=\frac{\sqrt[3]{\frac{6v}{\pi }}}{2}\text{, }M>0
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