7*6+9*4-12 (2*7+54/6*5) = (37+7*4-17) / 6+7*5 = (76 - (27+9) + 8) / 6*4 = (7,4+33) - 3*6/2=

7 * 6 + 9 * 4 - 12 * (2 * 7 + 54 : 6 * 5) = 42 + 36 - 12 * (14 + 9 * 5) = 78 - 12 * (14 + 45) = 78 -

- 12 * 59 = 78 - 708 = - 630;

(37 + 7 * 4 - 17) : 6 + 7 * 5 = (37 + 28 - 17) : 6 + 35 = 48 : 6 + 35 = 8 + 35 = 43;

(76 - (27 + 9) + 8) : 6 * 4 = (76 - 36 + 8) : 6 * 4 = (40 + 8) : 6 * 4 = 48 : 6 * 4 = 8 * 4 = 32;

(7,4 + 33) - 3 * 6 : 2 = 40,4 - 18 : 2 = 40,4 - 9 = 31,4.