2 * (6 * 5) = (2 * 5) * 6 = 10 * 6 = 60
(79 + 11) − 2 = 90 − 2 = 88
56 − (12 + 16) = (56 − 16) − 12 = 40 − 12 = 28
(4 * 2) * 3 = 4 * (2 * 3) = 4 * 6 = 24
48 + (25 + 12) = (48 + 12) + 25 = 60 + 25 = 85
13 + 24 + 7 + 6 = (13 + 7) + (24 + 6) = 20 + 30 = 50