Tìm x biết ​\(\begin{array}{l} - \frac{1}{3}x - \frac{1}{4} = \frac{5}{3} \end{array}\)

* Hướng dẫn giải

Ta có:

\(\begin{array}{l} - \frac{1}{3}x - \frac{1}{4} = \frac{5}{3}\\ - \frac{1}{3}x = \frac{5}{3} + \frac{1}{4}\\ - \frac{1}{3}x = \frac{{23}}{{12}}\\ x = \frac{{23}}{{12}}:\left( { - \frac{1}{3}} \right)\\ x = - \frac{{69}}{{12}} = - \frac{{23}}{4} \end{array}\)