\frac{dx_{1}}{dt} = \left(1 \cdot k_{9} \cdot k_{10} \cdot k_{11}^{k_{12}} \cdot k_{13} / \left(k_{11}^{k_{12}} + x_{3}^{k_{12}}\right) + -1 \cdot k_{9} \cdot k_{14} \cdot x_{1}\right) / k_{9}\\
\frac{dx_{2}}{dt} = \left(1 \cdot k_{9} \cdot k_{15} \cdot x_{1} \cdot k_{16} / \left(k_{16} + x_{3}\right) + -1 \cdot k_{9} \cdot k_{17} \cdot x_{2} / \left(k_{18} + x_{2}\right) + -1 \cdot k_{9} \cdot k_{19} \cdot x_{2}\right) / k_{9}