Solve for m, g, V, l
m=\frac{V}{800l}\text{, }g=\frac{V}{8000l}\text{, }V\in \mathrm{R}\text{, }l\neq 0
m=10g\text{, }g\in \mathrm{R}\text{, }V=0\text{, }l=0
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