How can the redshift be found when $\rho_m = \rho_\Lambda$ and when the cosmological constant begins to dominate from matter? Given that $\Omega_M \approx 0.3$ and $\Omega_\Lambda \approx0.7$ .
I've derived the equation below, however I'm not sure how to deduce the value of $\Omega_{CMB}$ when $\Lambda$ starts to dominate.
$\rho(z)=\rho_c (t_0)[\Omega_M (1+z)^{3}+\Omega_{CMB}(1+z)^{4}+\Omega_\Lambda]$
(Assuming expansion due to non-zero cosmological constant and that the universe content is matter and radiation.)