o o o = = + 2 = 2 × ( + 2) + 2 = 2 + 4 + 2 − 2 = 2 + 4 − 2 = 2 + 2 = 3 − 8 = 2 + 2 = 3 − 8 = 2 + 2 3 − 8 = 2 + 2 3 − 2 = 2 + 8 = 10