積分(2)の1．(2)の解答

$3$\displaystyle{ \int \frac{\hspace{2}2\hspace{2}}{\hspace{2} 5x- 4 \hspace{2}}dx }$
$3$\displaystyle{\begin{array}{lll}=& 2\cdot \frac{\hspace{2}1\hspace{2}}{\hspace{2}5\hspace{2}}\log \| 5x- 4 \| +C & \vspace{6}\\ =& \frac{\hspace{2}2\hspace{2}}{\hspace{2}5\hspace{2}}\log \| 5x- 4 \| +C & \vspace{6}\\ \end{array}}$
$3$\displaystyle{C}$ は積分定数
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