Here is a practice question on straight lines in the coordinate plane.

If the point $(a, -2)$ falls on the straight line $2y-3x=-6$ in the standard $(x, y)$ coordinate plane, then $a=$ ?

- $\quad -\dfrac{3}{2}$
- $\quad -\dfrac{2}{3}$
- $\quad \dfrac{2}{3}$
- $\quad \dfrac{3}{2}$
- $\quad \dfrac{10}{3}$

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