\frac{l - l_{0}}{ρ_{m u t t e r}} = \frac{l_{v} - l_{0}}{ρ_{m u t t e r} - ρ_{v e s i}}

${\frac{l - l_0}{\rho_{mutter}} = \frac{l_v - l_0}{\rho_{mutter} - \rho_{vesi}}}$

Error