h_{v 3} = \frac{ρ_{b} g h_{b} - ρ_{õ} g h_{õ}}{ρ_{v} g} = 6 c m

${h_{v3}= \frac{\rho_bgh_b-\rho_{\text{õ}} gh_{\text{õ}}}{\rho_vg} = {6}\,\mathrm{cm}}$

Error