Persiapan Ulangan 1

Menyelesaikan persamaan

\begin{equation*} \begin{split} ^2 \log [\: ^2 \log (2x - 10)] &= 1\\\\ \cancel{^2\log} [\: ^2 \log (2x - 10)] &= \: \cancel{^2\log} 2\\\\ ^2 \log (2x - 10) &= {\color {red} 2}\\\\ \cancel{^2 \log} (2x - 10) &= \:\cancel{^2 \log} 2^{\color {red} 2}\\\\ 2x - 10 &= 2^2\\\\ 2x &= 14\\\\ x &= 7 \end{split} \end{equation*}