Tìm x: 27/10-(2x -9/5)=-3/5
Giải thích
\[\frac{{27}}{{10}} - \left( {2x - \frac{9}{5}} \right) = - \frac{3}{5}\]
\[2x - \frac{9}{5} = \frac{{27}}{{10}} + \frac{3}{5}\]
\[2x - \frac{9}{5} = \frac{{33}}{{10}}\]
\[2x = \frac{{33}}{{10}} + \frac{9}{5}\]
\[2x = \frac{{51}}{{10}}\]
\[x = \frac{{51}}{{10}}:2\]
\[x = \frac{{51}}{{20}}\]
Vậy \[x = \frac{{51}}{{20}}.\]