Balancing redox reaction in a basic solution?

Ok, I'm completely confused and have spent the last two hours on one problem. Can someone help me with this? Balance the following equation in basic solution: Cl207 + H2O2 >ClO2 (-) + O2. I was able to balance the first half reaction, (the Cl2O7 to ClO2-), however what do I do with the second half? ... show more Ok, I'm completely confused and have spent the last two hours on one problem. Can someone help me with this?

Balance the following equation in basic solution: Cl207 + H2O2 >ClO2 (-) + O2.

I was able to balance the first half reaction, (the Cl2O7 to ClO2-), however what do I do with the second half? I don't understand how to work with the hydrogens and water.

Any help would be greatly appreciated.