-4*(-2*(-4y + 7) + 4) - 4 = 2*(-2*(-4y + 7) + 8
-4*(8y - 14 + 4) - 4 = 2*(8y - 14) + 8
-32y + 56 - 16 - 4 = 16y - 28 + 8
36 + 20 = 48y
y = 56/48
y = 1 1/6
Проверим:
-4*(-2*(-4*7/6 +7) + 4) - 4 = 2*(-2*(-4*7/6 + 7) + 8
-4*((28/3 - 14) + 4) - 4 = 2*((28/3 - 14) + 8
-112/3 + 56 - 16 - 4 = 56/3 - 28 + 8
-37 1/3 + 36 = 18 2/3 - 20
36 + 20 = 37 1/3 + 18 2/3
56 = 56
Ответ: {1 1/6}