\begin{equation*}
\begin{split}
^3 \log(x - 4) & = 1 \\\\
\cancel {^3 \log} (x - 4) & = \cancel {^3 \log} 3 \\\\
x - 4 & = 3 \\\\
x & = 7
\end{split}
\end{equation*}
Syarat terdefinisi
\begin{equation*}
x - 4 = 7 - 4 \: {\color {blue} > 0 \quad \text{ OK!}}
\end{equation*}
HP = {7}
