write a balanced equation for the combustion of benzene.

All hydrocarbons, like benzene are, are the same. Add O2. C goes to CO2 and H goes to H2O.
C6H6 + O2 ==> CO2 + H2O
I will let you balance it. Let me know if you have a problem with it.

would it be...

C6H6 + 14O2 --> 6C02 + 4H2O