Tìm x biết: -4/7x + 7/5 = -1/8 : (-1 + 2/3)

\[\frac{{ - 4}}{{7x}} + \frac{7}{5} = \frac{{ - 1}}{8}:\left( { - 1 + \frac{2}{3}} \right)\]

\[\frac{{ - 4}}{{7x}} + \frac{7}{5} = \frac{{ - 1}}{8}:\frac{{ - 1}}{3}\]

\[\frac{{ - 4}}{{7x}} + \frac{7}{5} = \frac{3}{8}\]

\[\frac{{ - 4}}{{7x}} = \frac{3}{8} - \frac{7}{5}\]

\[\frac{{ - 4}}{{7x}} = \frac{{ - 41}}{{40}}\]

 x = \(\frac{{\left( { - 4} \right).40}}{{7.\left( { - 41} \right)}} = \frac{{160}}{{287}}\).