Tìm x, biết: \(\,x + \frac{1}{2} = \frac{{ - 3}}{4}\)

* Hướng dẫn giải

\(\begin{array}{l}\,x + \frac{1}{2} = \frac{{ - 3}}{4} \Leftrightarrow x = \frac{{ - 3}}{4} - \frac{1}{2}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \Leftrightarrow x = \frac{{ - 5}}{4}\end{array}\)                    

Vậy \(x = \frac{{ - 5}}{4}\)   

Chọn B