Cho biết có bao nhiêu giá trị của x thỏa mãn ​\(\left( {x - \dfrac{{11}}{{25}}} \right):\dfrac{3}{{25}} = - \dfrac{7}{{15}} - \dfrac{8}{6}?\)

* Hướng dẫn giải

Ta có:

\(\begin{array}{l}\left( {x - \dfrac{{11}}{{25}}} \right):\dfrac{3}{{25}} = - \dfrac{7}{{15}} - \dfrac{8}{6}\\\left( {x - \dfrac{{11}}{{25}}} \right):\dfrac{3}{{25}} = - \dfrac{9}{5}\\x - \dfrac{{11}}{{25}} = - \dfrac{9}{5}.\dfrac{3}{{25}}\\x - \dfrac{{11}}{{25}} = - \dfrac{{27}}{{125}}\\x = \dfrac{{28}}{{125}}\end{array}\)