Let \( \beta = \displaystyle\lim_{x \to 0} \dfrac{\alpha x - \left(e^{3x}-1\right)}{\alpha x \left(e^{3x}-1\right)} \) for some \( \alpha \in R \). Then the value of \( \alpha + \beta \) is:
\( \dfrac{14}{5} \)
\( \dfrac{3}{2} \)
\( \dfrac{5}{2} \)
\( \dfrac{7}{2} \)