The permittivity of free space is given by $\epsilon_0 = \frac{1}{4\pi k}$, where $k$ is Coulomb's constant. So, we can write the net electric flux through the cube as:
\[
\Phi_{\text{net}} = \frac{Q_{\text{enclosed}}}{\epsilon_0} = Q_{\text{enclosed}} \cdot 4\pi
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