\frac{dx_{7}}{dt} = \left(1 \cdot k_{27} \cdot k_{18} \cdot x_{5} + -1 \cdot k_{27} \cdot k_{18} \cdot x_{7}\right) / k_{27}\\
\frac{dx_{8}}{dt} = \left(1 \cdot k_{27} \cdot k_{18} \cdot x_{7} + -1 \cdot k_{27} \cdot k_{18} \cdot x_{8}\right) / k_{27}\\
\frac{dx_{9}}{dt} = \left(1 \cdot k_{27} \cdot k_{18} \cdot x_{8} + -1 \cdot k_{27} \cdot k_{18} \cdot x_{9}\right) / k_{27}\\
\frac{dx_{10}}{dt} = \left(1 \cdot k_{27} \cdot k_{18} \cdot x_{9} + -1 \cdot k_{27} \cdot k_{18} \cdot x_{10}\right) / k_{27}\\
\frac{dx_{11}}{dt} = \left(1 \cdot k_{27} \cdot k_{19} \cdot x_{6} + -1 \cdot k_{27} \cdot k_{19} \cdot x_{11}\right) / k_{27}\\
\frac{dx_{12}}{dt} = \left(1 \cdot k_{27} \cdot k_{19} \cdot x_{11} + -1 \cdot k_{27} \cdot k_{19} \cdot x_{12}\right) / k_{27}\\
\frac{dx_{13}}{dt} = \left(1 \cdot k_{27} \cdot k_{19} \cdot x_{12} + -1 \cdot k_{27} \cdot k_{19} \cdot x_{13}\right) / k_{27}\\
\frac{dx_{14}}{dt} = \left(1 \cdot k_{27} \cdot k_{19} \cdot x_{13} + -1 \cdot k_{27} \cdot k_{19} \cdot x_{14}\right) / k_{27}\\
\frac{dx_{1}}{dt} = \left(1 - x_{3}\right) \cdot \left(1 - x_{4}\right) \cdot k_{26} \cdot x_{1} \cdot \left(1 - x_{1} / k_{24}\right) - \left(1 + x_{10}\right) \cdot \left(1 + x_{14}\right) \cdot k_{25} \cdot x_{1}\\
\frac{dx_{2}}{dt} = \left(1 + x_{10}\right) \cdot \left(1 + x_{14}\right) \cdot k_{25} \cdot x_{1} - k_{25} \cdot x_{2}