Answer:
(11, -1)
Explanation:
We get the midpoint by "averaging" the x-coordinates and y-coordinates.
One endpoint is (3,2) and let the other end point be (x,y). Thus, we can say:
- average of 3 and x is 7 [x coordinate of midpoint], and
- average of 2 and y is 1/2 [y coordinate of midpoint]
Let's do the math:

And

The other endpoint coordinates is thus:
(11, -1)