(3-9 * 9-4) / 27-6 = (3-9 * (32)-4) / (33)-6 = (3-9 * 3-8) / 3-18 = 3-9 - 8 / 3-18 = 3-17 / 3-18 = 3-17 - (-18) = 3-17 + 18 = 31 = 3
Ответ: 3