So, we can write the following equations:
(1) $\frac{-1 + x}{2} = 4$
(2) $\frac{3 + y}{2} = 10$
Now, we can solve these equations for x and y.
For equation (1):
$-1 + x = 8$
$x = 9$
For equation (2):
$3 + y = 20$
$y = 17$
So, the coordinates of endpoint
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