p = \frac { 8509 r } { 1000 m L } = 0,85 g / m L
Solve for r
r=\frac{850gL^{2}}{8509}
L\neq 0\text{ and }p=\frac{17Lg}{20m}\text{ and }m\neq 0
Solve for p
\left\{\begin{matrix}p=0\text{, }&L\neq 0\text{ and }r=0\text{ and }g=0\text{ and }m\neq 0\\p=\frac{8509r}{1000Lm}\text{, }&g\neq 0\text{ and }\left(g>0\text{ or }r<0\right)\text{ and }m\neq 0\text{ and }\left(r>0\text{ or }g<0\right)\text{ and }r\neq 0\text{ and }L\neq 0\text{ and }|L|=\frac{\sqrt{\frac{289306r}{g}}}{170}\end{matrix}\right.
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