Решим уравнение:
$$3x - 5(2x + 1) = 3(3 - 2x)$$
$$3x - 10x - 5 = 9 - 6x$$
$$-7x - 5 = 9 - 6x$$
$$-7x + 6x = 9 + 5$$
$$-x = 14$$
$$x = -14$$
Ответ: -14