The chemical equation you provided is not balanced and also contains a couple of errors:

* Incorrect formula for sodium hydroxide: NaOH2 should be NaOH (sodium hydroxide only has one hydroxide ion).

* Incorrect formula for sodium bicarbonate: NaHCo3 should be NaHCO3 (the correct spelling is "HCO3" for bicarbonate).

The correct and balanced chemical equation for the reaction of sodium bicarbonate and sodium hydroxide to form sodium carbonate, water, and carbon dioxide is:

NaHCO3 + NaOH → Na2CO3 + H2O + CO2

Here's how it's balanced:

* Sodium (Na): 1 on each side

* Hydrogen (H): 2 on each side

* Carbon (C): 2 on each side

* Oxygen (O): 5 on each side