The complete combustion of benzene (C6H6) with oxygen (O2) produces carbon dioxide (CO2) and water (H2O). The balanced equation for this reaction is:

```

C6H6 + 15/2 O2 -> 6 CO2 + 3 H2O

```

In this equation, one molecule of benzene reacts with 15/2 molecules of oxygen to produce 6 molecules of carbon dioxide and 3 molecules of water. The combustion process involves the complete oxidation of carbon atoms in benzene to form carbon dioxide and the combination of hydrogen atoms with oxygen to form water.