Выполните действия: \(-\dfrac{4}{21}\) ∙ \((-\dfrac{7}{12})\) + \(\dfrac{3}{4}\) ∙ \((-\dfrac{8}{9})\) .

• \(-\dfrac{5}{9}\)
• \(-\dfrac{1}{9}\)
• \(-\dfrac{1}{3}\)
• \(\dfrac{1}{3}\)