\frac{dx_{1}}{dt} = \left(-1 \cdot k_{28} \cdot \left(\left(k_{10} \cdot k_{8} + k_{11} \cdot k_{7}\right) / \left(k_{8} + k_{7} \cdot \left(1 + k_{8} / k_{4}\right)\right) \cdot k_{29} \cdot x_{1} - \left(k_{14} + k_{16} \cdot k_{7}\right) / \left(1 + k_{7} / k_{17}\right) \cdot x_{2}\right) + -1 \cdot k_{28} \cdot \left(\left(k_{3} \cdot k_{4} + k_{5}\right) \cdot k_{7} / \left(k_{4} + k_{7} \cdot \left(1 + k_{4} / k_{8}\right)\right) \cdot x_{1} - \left(k_{30} + k_{31}\right) \cdot x_{3}\right)\right) / k_{28}\\
\frac{dx_{2}}{dt} = \left(1 \cdot k_{28} \cdot \left(\left(k_{10} \cdot k_{8} + k_{11} \cdot k_{7}\right) / \left(k_{8} + k_{7} \cdot \left(1 + k_{8} / k_{4}\right)\right) \cdot k_{29} \cdot x_{1} - \left(k_{14} + k_{16} \cdot k_{7}\right) / \left(1 + k_{7} / k_{17}\right) \cdot x_{2}\right) + -1 \cdot k_{28} \cdot \left(k_{19} \cdot k_{17} / \left(k_{17} + k_{7}\right) \cdot x_{2} - k_{32} \cdot x_{4}\right) + -1 \cdot k_{28} \cdot \left(\left(k_{21} \cdot k_{17} + k_{22}\right) \cdot k_{7} / \left(k_{17} + k_{7}\right) \cdot x_{2} - k_{4} \cdot \left(k_{24} + k_{25}\right) / \left(k_{4} + k_{7}\right) \cdot x_{5}\right)\right) / k_{28}\\
\frac{dx_{3}}{dt} = 1 \cdot k_{28} \cdot \left(\left(k_{3} \cdot k_{4} + k_{5}\right) \cdot k_{7} / \left(k_{4} + k_{7} \cdot \left(1 + k_{4} / k_{8}\right)\right) \cdot x_{1} - \left(k_{30} + k_{31}\right) \cdot x_{3}\right) / k_{28}\\
\frac{dx_{4}}{dt} = 1 \cdot k_{28} \cdot \left(k_{19} \cdot k_{17} / \left(k_{17} + k_{7}\right) \cdot x_{2} - k_{32} \cdot x_{4}\right) / k_{28}\\
\frac{dx_{5}}{dt} = \left(1 \cdot k_{28} \cdot \left(\left(k_{21} \cdot k_{17} + k_{22}\right) \cdot k_{7} / \left(k_{17} + k_{7}\right) \cdot x_{2} - k_{4} \cdot \left(k_{24} + k_{25}\right) / \left(k_{4} + k_{7}\right) \cdot x_{5}\right) + -1 \cdot k_{28} \cdot \left(\left(k_{3} \cdot k_{4} + k_{5}\right) \cdot k_{7} / \left(k_{4} + k_{7}\right) \cdot x_{5} - \left(k_{33} + k_{34}\right) \cdot x_{6}\right)\right) / k_{28}\\
\frac{dx_{6}}{dt} = 1 \cdot k_{28} \cdot \left(\left(k_{3} \cdot k_{4} + k_{5}\right) \cdot k_{7} / \left(k_{4} + k_{7}\right) \cdot x_{5} - \left(k_{33} + k_{34}\right) \cdot x_{6}\right) / k_{28}