Đáp án:
Giải thích các bước giải:
\[\begin{array}{l}\left( {2.5 - 3x} \right):1{\rm{ }}2/3{\rm{ }} = {\rm{ }}\left( {8/5 + 2x} \right){\rm{ }}:{\rm{ }} - 8/17\\ \Leftrightarrow \left( {2,5 - 3x} \right):1\frac{2}{3} = \left( {\frac{8}{5} + 2x} \right):\frac{{ - 8}}{{17}}\\ \Leftrightarrow \left( {\frac{5}{2} - 3x} \right).\frac{3}{5} = \left( {\frac{8}{5} + 2x} \right).\frac{{ - 17}}{8}\\ \Leftrightarrow \frac{3}{2} - \frac{9}{5}x = \frac{{ - 17}}{5} - \frac{{17}}{4}x\\ \Leftrightarrow - \frac{9}{5}x + \frac{{17}}{4}x = \frac{{ - 17}}{5} - \frac{3}{2}\\ \Leftrightarrow \frac{{49}}{{20}}x = \frac{{ - 49}}{{10}}\\ \Leftrightarrow x = \frac{{ - 49}}{{10}}.\frac{{20}}{{49}}\\ \Leftrightarrow x = - 2\end{array}\]
