$(1$ point$)$

Let $f(x)$ be a function that is defined and has a continuous derivative on the interval $(2,).$ Assume also that

${\displaystyle \underset{2}{\overset{}{}}}f(x)e^{-\frac{x}{3}}dx=4{\displaystyle \underset{2}{\overset{}{}}}{f}^{\text{'}}(x)e^{-\frac{x}{3}}dxf(2)=15$

$|f(x)|$

and

${\displaystyle \underset{2}{\overset{}{}}}f(x)e^{-\frac{x}{3}}dx=4$

Determine the value $of$

${\displaystyle \underset{2}{\overset{}{}}}{f}^{\text{'}}(x)e^{-\frac{x}{3}}dx$