\(\left(\dfrac{377}{-231}-\dfrac{123}{89}+\dfrac{34}{791}\right).\left(\dfrac{1}{6}-\dfrac{1}{8}-\dfrac{1}{24}\right)\\ =\left(\dfrac{377}{-231}-\dfrac{123}{89}+\dfrac{34}{791}\right).\left(\dfrac{4}{24}-\dfrac{3}{24}-\dfrac{1}{24}\right)\\ =\left(\dfrac{377}{-231}-\dfrac{123}{89}+\dfrac{34}{791}\right).0\\ =0\)