\(\frac{2}{5} +\frac{ 3}{5} : ( \frac{ 3}{5} + \frac{-2}{3} ) - \frac{7}{2}\)
\(=\frac{2}{5} +\frac{ 3}{5} : ( \frac{ 9}{15} + \frac{-10}{15} ) - \frac{7}{2}\)
\(=\frac{2}{5} +\frac{ 3}{5} : \frac{-1}{15} - \frac{7}{2}\)
\(=\frac{2}{5} +\frac{ 3}{5}.(-15) - \frac{7}{2}\)
\(=\frac{2}{5} -9 - \frac{7}{2}\)
\(=\frac{4}{10} - \frac{35}{10}-9\)
\(= - \frac{31}{10}-\frac{90}{10}\)
\(= - \frac{121}{10}\)
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