(75 + 20) : 5 − 1 = 95 : 5 − 1 = 19 − 1 = 18;
75 + (20 : 5 − 1) = 75 + (4 − 1) = 75 + 3 = 78;
75 + 20 : (5 − 1) = 75 + 20 : 4 = 75 + 5 = 80;
80 : (5 + 3) * 5 = 80 : 8 * 5 = 10 * 5 = 50;
80 : (5 + 3 * 5) = 80 : (5 + 15) = 80 : 20 = 4;
(80 : 5 + 3) * 5 = (16 + 3) * 5 = 19 * 5 = 95.