2 2 + 2 − 12 2 (2 + 2 − 12): 2 = 2 2 2 × ( + − 6) = 2 2 = + − 6 2 = + − 6 2 = (9) + (9) − 6 = 81 + 9 − 6 = 84 = 2 − 4 = 9