3. Решите уравнение: 5(3х – 5) – 3(6x − 3) = 5x-4
$$15x - 25 - 18x + 9 = 5x - 4$$
$$15x - 18x - 5x = -4 + 25 - 9$$
$$-8x = 12$$
$$x = -\frac{12}{8} = -\frac{3}{2} = -1,5$$ Ответ: -1,5