$$\begin{aligned} &\text { If }-2 x+1 \geq 9 \text {, then }\\ &\Rightarrow \quad \begin{aligned} -2 x \geq 9-1 & \Rightarrow-2 x \geq 8 \\ 2 x \leq-8 & \Rightarrow x \leq-4 \end{aligned} \end{aligned}$$