Calculate the delta H rxn of the following reaction?

Calculate the delta H rxn of the following reaction:
CH4(g)+2O2(g)-->CO2(g)+2H2O(l)

Use the following reactions and given delta H's:
CH4(g)+O2(g)-->CH2O(g)+H2O(g), delta H=-284kJ
CH2O(g)+O2(g)-->CO2(g)+H2O(g), delta H=-527kJ
H2O(l)-->H2O(g), delta H=44.0kJ
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