Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2xA/ Esercizi: http://www.khanacademy.org/exercises?exid=linear_equations_3 Traduzione in Italiano del video: Equations 3 http://www.youtube.com/watch?v=f15zA0PhSek http://www.khanacademy.org/video/equations-3?playlist=Algebra