\frac{dx_{1}}{dt} = 0\\
\frac{dx_{2}}{dt} = \left(1 \cdot k_{3} \cdot k_{4} \cdot k_{14} + -1 \cdot k_{3} \cdot x_{4} \cdot k_{6} \cdot x_{2} / \left(k_{5} + x_{2}\right) + -1 \cdot k_{3} \cdot k_{8} \cdot x_{2} + -2 \cdot k_{3} \cdot \left(k_{9} \cdot x_{2}^{2} - k_{10} \cdot x_{5}\right)\right) / k_{3}\\
\frac{dx_{3}}{dt} = \left(1 \cdot k_{3} \cdot x_{4} \cdot k_{6} \cdot x_{2} / \left(k_{5} + x_{2}\right) + -1 \cdot k_{3} \cdot k_{7} \cdot x_{3}\right) / k_{3}\\
\frac{dx_{4}}{dt} = 0 / k_{3}\\
\frac{dx_{5}}{dt} = \left(1 \cdot k_{3} \cdot \left(k_{9} \cdot x_{2}^{2} - k_{10} \cdot x_{5}\right) + -1 \cdot k_{3} \cdot k_{11} \cdot x_{5} + -1 \cdot k_{3} \cdot x_{4} \cdot k_{13} \cdot x_{5} / \left(k_{12} + x_{5}\right)\right) / k_{3}