4) (10x − 4)(3x + 2)(6x − 1) = 0

10x − 4 = 0, 3x + 2 = 0 или 6x − 1 = 0.

Ответ: x = \(\frac{2}{5}\); x = −\(\frac{2}{3}\); x = \(\frac{1}{6}\).