I like it
I reminds me of the song Friedenspanzer by Die Ärzte.
If I may continue Mayhap's thought: I think the Point is that those equations dont work. enemy + enemy = war is ok, but enemy - enemy = peace is a paradoxon. Thats why peacetank looked for a new equation that makes sense. ;) I think the whole movie is a symbol: Make love not war. But I guess everyone already found that out. lol