= 3 − 2 = 2 + 4 = + 8 62 = (3 − 2) + (2 + 4) 62 = 3 + 2 − 2 + 4 62 = 5 + 3 62 − 2 = 5 + 2 − 2 60 5 = 5 5 12 = → = 12