Can't figure out how to set this up; chem homework. Thanks in advance.?

Calculate the heat of combustion of ethene (C2H4) using the given data:
Heat of formation method ( Ans -1323 kJ/mol)

C2H4 (g) + 3O2(g) → 2CO2(g) + 2H2O (g)

ΔHf° C2H4 = +52.4 kJ/mol ; ΔHf° CO2 = -393.5 kJ/mol ; ΔHf° H2O = -241.8 kJ/mol
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