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Determining the oxidation half reactions for an equation

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What is the oxidation half reaction for: 2H2O-->O2(g)+2H2(g)

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The solution determines the oxidation half reactions for an equation

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4 H20 + 4 e- -> 2 H2 (g) + 4 OH- (aq)
2H20 - -> O2 (g) + 4 e- + 4 H + (aq)

Adding the two equations

6 H20+ 4 e- - -> 2 H2 (g) + O2 (g) + 4 e- + 4 H + (aq) ...

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