\frac{dx_{1}}{dt} = 0\\
\frac{dx_{2}}{dt} = \left(1 \cdot k_{1} \cdot k_{2} / \left(1 + x_{3} / k_{3}^{k_{4}}\right) + -1 \cdot k_{1} \cdot k_{8} \cdot x_{2}\right) / k_{1}\\
\frac{dx_{3}}{dt} = \left(1 \cdot k_{1} \cdot k_{5} \cdot \operatorname{delay}\left(x_{2}, k_{7}\right)^{k_{6}} + -1 \cdot k_{1} \cdot k_{9} \cdot x_{3}\right) / k_{1}