Решите уравнение: \(-\frac{4}{7}y = \frac{8}{21}.\)

• \(-\frac{2}{3}\)
• \(\frac{2}{3}\)
• \(\frac{2}{7}\)
• \(-1\frac{1}{2}\)
• \(\frac{3}{7}\)
• \(1\frac{1}{2}\)