What is the chemical equation for the reduction of NO3- to N2O and then N2O to N2?

The half equation for the reduction of NO₃⁻ to N₂O:
In acidic medium: 2NO₃⁻(aq) + 10H⁺(aq) + 8e⁻ → N₂O(g) + 5H₂O(l)
In basic medium: 2NO₃⁻(aq) + 5H₂O(l) + 8e⁻ → N₂O(g) + 10OH⁻(aq)

The half equation for the reduction of N₂O to N₂:
In acidic medium: N₂O(g) + 2H⁺(aq) + 2e⁻ → N₂(g) + H₂O(l)
In basic medium: N₂O(g) + H₂O(l) + 2e⁻ → N₂(g) + 2OH⁻(aq)