How do I calculate the enthalpy of formation of ethanol?

I am very confused on how to calculate this. Please show me the process with explanations. Thanks!

Calculate the standard enthalp of formation of ethanol C2H5OH (l) from the heat of combustion of ethanol, which is -1368 kJ/mol, by using tabulated standard enthalpies of formation for CO2 (g) and H20 (l).
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