Решим уравнение: $$7 - 3(5x - 3) = -11x$$
$$7 - 15x + 9 = -11x$$
$$16 - 15x = -11x$$
$$16 = -11x + 15x$$
$$16 = 4x$$
$$x = 16:4$$
$$x = 4$$
Ответ: 4