To translate the point \((-3, -2)\) 5 units to the left, you need to subtract 5 from the x-coordinate.
So, the new x-coordinate will be:
\[ -3 - 5 = -8 \]
The y-coordinate remains the same since there is no vertical translation involved. Therefore, the y-coordinate will still be:
\[ -2 \]
Thus, the new coordinates of the point after the translation will be:
\[ (-8, -2) \]
So, the vertex of the triangle in the translated figure will be \((-8, -2)\).