There are 1 questions in this calculation: for each question, the 1 derivative of x is calculated.
    Note that variables are case sensitive.
\[ \begin{equation}\begin{split}[1/1]Find\ the\ first\ derivative\ of\ function\ \frac{ln(\frac{2}{5} - x)}{\frac{2}{5}}\ with\ respect\ to\ x：\\\end{split}\end{equation} \]\[ \begin{equation}\begin{split}\\Solution:&\\ &Primitive\ function\ = \frac{5}{2}ln(-x + \frac{2}{5})\\&\color{blue}{The\ first\ derivative\ function：}\\&\frac{d\left( \frac{5}{2}ln(-x + \frac{2}{5})\right)}{dx}\\=&\frac{\frac{5}{2}(-1 + 0)}{(-x + \frac{2}{5})}\\=&\frac{-5}{2(-x + \frac{2}{5})}\\ \end{split}\end{equation} \]

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