If \( 2x^{y} + 3y^{x} = 20 \), then \( \dfrac{dy}{dx} \) at \( (2, 2) \) is equal to:
\( -\!\left( \dfrac{3 + \log_{e} 4}{2 + \log_{e} 8} \right) \)
\( -\!\left( \dfrac{3 + \log_{e} 8}{2 + \log_{e} 4} \right) \)
\( -\!\left( \dfrac{2 + \log_{e} 8}{3 + \log_{e} 4} \right) \)
\( -\!\left( \dfrac{3 + \log_{e} 16}{4 + \log_{e} 8} \right) \)