91 : 7 − (3 + 8) = (70 + 21) : 7 − 11 = 10 + 3 − 11 = 13 − 11 = 2
16 * 4 − (24 + 7) = (10 + 6) * 4 − 31 = 40 + 24 − 31 = 64 − 31 = 33
80 : 2 − (14 + 16) = 40 − 30 = 10
(45 + 32) − 15 * 3 = (45 + 32) − 45 = (45 − 45) + 32 = 32
(12 + 18) * (12 : 6) = 30 * 2 = 60
(21 + 49) : (14 : 2) = 70 : 7 = 10