It would be more useful to be able to cut a pizza into seven equal pieces. And to know how many 6-packs to buy so 7 people can each have an equal number of cans.
The six pack thingy is easy. The answer is one. The designated driver gets to watch!
easy skip the pizza, buy a keg the two left standing order a pizza and the one who is still standing eats it...the one who ate the pizza slept in the chunks...first one out was the first one who woke ,second to wake is cooking breakfast with the first, third wakes up in time for breakfast along with the forth, fifth wakes up does not want anything to eat along with the 6th who pee'd himself while they poke fun at the still drunk pizza eater with chuncks in his hair and is still sleeping.