Source TeX:

\begin{array}{rclcrcl} 5-8x & \geq & 0 &\quad\text{ et }\quad& 3x+9 & \geq & 0 \\[0.8em]-8x & \geq & -5 & {} & 3x & \geq & -9 \\[0.8em]x & \mathbf{\leq} & \dfrac{5}{8} & {} & x & \geq & -3 \end{array}