Решим уравнение:
$$2 \cdot (5 - x) - 4x = 28$$
$$10 - 2x - 4x = 28$$
$$10 - 6x = 28$$
$$-6x = 28 - 10$$
$$-6x = 18$$
$$x = \frac{18}{-6}$$
$$x = -3$$
Ответ: -3