\((25)^{2x + 1} \geq (125)^{2x - 4}\)
\begin{equation*}
\begin{split}
(25)^{2x + 1} & \geq (125)^{2x - 4} \\\\
(5^2)^{2x + 1} & \geq (5^3)^{2x - 4} \\\\
5^{4x + 2} & \geq 5^{6x - 12} \\\\
\cancel{5}^{4x + 2} & \geq \cancel{5}^{6x - 12} \\\\
4x + 2 & \geq 6x - 12 \\\\
-2x & \geq -14 \quad {\color {blue} \text{bagi (-2) pada kedua ruas, tanda berubah}}\\\\
x & \leq 7
\end{split}
\end{equation*}
HP = \(\{ x \leq 7, \: x \in R \}\)