\frac{dx_{1}}{dt} = \left(1 \cdot k_{31} \cdot \left(k_{3} \cdot x_{4} \cdot x_{14} - x_{1} \cdot k_{4}\right) + 1 \cdot k_{31} \cdot \left(\left(k_{6} + x_{8}\right) \cdot x_{2} - \left(k_{5} + x_{7}\right) \cdot x_{1}\right)\right) / k_{31}\\
\frac{dx_{2}}{dt} = \left(-1 \cdot k_{31} \cdot \left(\left(k_{6} + x_{8}\right) \cdot x_{2} - \left(k_{5} + x_{7}\right) \cdot x_{1}\right) + -1 \cdot \left(k_{14} \cdot x_{2} \cdot x_{11} - k_{15} \cdot x_{12}\right) \cdot k_{31} + 1 \cdot k_{31} \cdot k_{16} \cdot k_{19} \cdot x_{13} + -1 \cdot k_{31} \cdot \left(k_{7} + k_{18} \cdot x_{10}\right) \cdot x_{2}\right) / k_{31}\\
\frac{dx_{3}}{dt} = 0 / k_{31}\\
\frac{dx_{5}}{dt} = \left(-1 \cdot k_{31} \cdot \left(\left(k_{24} + k_{27} \cdot x_{2}\right) \cdot x_{5} - x_{6} \cdot k_{21}\right) + -1 \cdot k_{31} \cdot k_{9} \cdot x_{5} + 1 \cdot k_{31} \cdot k_{8}\right) / k_{31}\\
\frac{dx_{6}}{dt} = \left(1 \cdot k_{31} \cdot \left(\left(k_{24} + k_{27} \cdot x_{2}\right) \cdot x_{5} - x_{6} \cdot k_{21}\right) + -1 \cdot k_{31} \cdot \left(\left(k_{24} + k_{27} \cdot x_{2}\right) \cdot x_{6} - k_{21} \cdot x_{7}\right) + -1 \cdot k_{31} \cdot k_{9} \cdot x_{6}\right) / k_{31}\\
\frac{dx_{7}}{dt} = \left(1 \cdot k_{31} \cdot \left(\left(k_{24} + k_{27} \cdot x_{2}\right) \cdot x_{6} - k_{21} \cdot x_{7}\right) + -1 \cdot k_{31} \cdot k_{9} \cdot x_{7}\right) / k_{31}\\
\frac{dx_{8}}{dt} = \left(1 \cdot k_{10} \cdot k_{31} + -1 \cdot k_{31} \cdot \left(\left(k_{25} + k_{28} \cdot x_{2}\right) \cdot x_{8} - k_{22} \cdot x_{9}\right) + -1 \cdot k_{31} \cdot x_{8} \cdot k_{11}\right) / k_{31}\\
\frac{dx_{9}}{dt} = \left(1 \cdot k_{31} \cdot \left(\left(k_{25} + k_{28} \cdot x_{2}\right) \cdot x_{8} - k_{22} \cdot x_{9}\right) + -1 \cdot k_{31} \cdot k_{11} \cdot x_{9}\right) / k_{31}\\
\frac{dx_{10}}{dt} = \left(1 \cdot k_{31} \cdot x_{2}^{2} / \left(k_{20}^{2} + x_{2}^{2}\right) / k_{30} + -1 \cdot k_{31} \cdot x_{10} / k_{30}\right) / k_{31}\\
\frac{dx_{11}}{dt} = \left(1 \cdot k_{12} \cdot k_{31} + -1 \cdot \left(k_{14} \cdot x_{2} \cdot x_{11} - k_{15} \cdot x_{12}\right) \cdot k_{31} + -1 \cdot k_{31} \cdot k_{13} \cdot x_{11}\right) / k_{31}\\
\frac{dx_{12}}{dt} = \left(1 \cdot \left(k_{14} \cdot x_{2} \cdot x_{11} - k_{15} \cdot x_{12}\right) \cdot k_{31} + -1 \cdot k_{31} \cdot \left(\left(k_{26} + k_{29} \cdot x_{2}\right) \cdot x_{12} - k_{23} \cdot x_{13}\right)\right) / k_{31}\\
\frac{dx_{13}}{dt} = \left(1 \cdot k_{31} \cdot \left(\left(k_{26} + k_{29} \cdot x_{2}\right) \cdot x_{12} - k_{23} \cdot x_{13}\right) + -1 \cdot k_{31} \cdot k_{16} \cdot k_{19} \cdot x_{13}\right) / k_{31}\\
\frac{dx_{14}}{dt} = \left(1 \cdot k_{1} \cdot k_{31} + -1 \cdot k_{31} \cdot \left(k_{3} \cdot x_{4} \cdot x_{14} - x_{1} \cdot k_{4}\right) + -1 \cdot k_{31} \cdot \left(k_{2} + k_{17} \cdot x_{10}\right) \cdot x_{14}\right) / k_{31}