Tìm \(x\), biết: \(\left( - x} {\dfrac{{ - 5}}{6}} \right) = \dfrac{{ - 7}}{3}\)

* Hướng dẫn giải

\(\begin{array}{l}b)\,\,\left( {\dfrac{4}{3} - x} \right).\left( {\dfrac{{ - 5}}{6}} \right) = \dfrac{{ - 7}}{3}\\\,\,\,\,\,\,\,\dfrac{4}{3} - x = \dfrac{{ - 7}}{3}:\dfrac{{ - 5}}{6}\\\,\,\,\,\,\,\,\dfrac{4}{3} - x = \dfrac{{14}}{5}\\\,\,\,\,\,\,\,x = \dfrac{4}{3} - \dfrac{{14}}{5}\\\,\,\,\,\,\,\,x = \dfrac{{ - 22}}{{15}}\end{array}\)

Vậy \(x =  - \dfrac{{22}}{{15}}.\)