Replace r with 1.2....you'll get 6(1.2)+7....multiply the 6×1.2=7.2 then add 7
7.2+7=14.2
I need to know what argument you are talking you are talking about to answer the question.
The author used this analogy to show that the Iroquois Confederacy that the system they used was effective and equal everyone involved rather than just one entity (making them interconnected).