\frac{dx_{1}}{dt} = 1 \cdot k_{9} \cdot \left(\left(-x_{1}\right) / k_{6} + k_{5} \cdot k_{4} / k_{6}\right) / k_{9}\\
\frac{dx_{2}}{dt} = 1 \cdot k_{9} \cdot \left(\left(-x_{2}\right) / k_{8} + k_{7} \cdot k_{4} / k_{8}\right) / k_{9}\\
\frac{dx_{3}}{dt} = 1 \cdot k_{9} \cdot \left(k_{10} \cdot x_{10} - k_{11} \cdot x_{3} - k_{12} \cdot x_{4} \cdot x_{3}\right) / k_{9}\\
\frac{dx_{4}}{dt} = 1 \cdot k_{9} \cdot k_{13} \cdot x_{3} / k_{9}\\
\frac{dx_{5}}{dt} = 1 \cdot k_{9} \cdot \left(k_{14} \cdot x_{3} - k_{15} \cdot x_{5}\right) / k_{9}\\
\frac{dx_{6}}{dt} = 1 \cdot k_{9} \cdot \left(x_{3} \cdot x_{5}^{k_{17}} / \left(k_{16}^{k_{17}} + x_{3} \cdot x_{5}^{k_{17}}\right) - k_{1} \cdot x_{6}\right) / k_{9}\\
\frac{dx_{7}}{dt} = 1 \cdot k_{9} \cdot \left(k_{20} \cdot x_{9} - k_{19} \cdot x_{7} - k_{2} \cdot x_{7} \cdot x_{10} + k_{3} \cdot x_{8}\right) / k_{9}\\
\frac{dx_{8}}{dt} = 1 \cdot k_{9} \cdot \left(k_{2} \cdot x_{7} \cdot x_{10} - k_{21} \cdot x_{8} - k_{3} \cdot x_{8}\right) / k_{9}\\
\frac{dx_{9}}{dt} = 1 \cdot k_{9} \cdot \left(k_{1} \cdot x_{6} - k_{18} \cdot x_{9}\right) / k_{9}