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mathmate
It turns out that the centroid of a triangle with given vertex coordinates is located at the mean of the three coordinates.
This can be validated by calculating the intersection of the medians.

So 
Centroid=(-6-4+0, 0+4+2)/3=(-10/3,2)
evgeniylevi
Consider this long way.
Note, point O is the centroid of the triangle.
Ver imagen evgeniylevi

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