Curb your Enthusiasm, South Park, The Colbert Report, Daily Show with John Stewart
Airplane, History of the World
you have to bring all the numbers to one side of the equal sign and all "letter numbers" to the other by using the opposite signs preceeding them..so
7-6a = 6-7a
bringing the numbers to the other side of the equal sign
7-6 - 6a = -7a
1 - 6a = -7a
bringing the "letter...