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If (x(1),y1,z1) and (x2,y2,z2) are two v...

If `(x_(1),y_1,z_1)` and `(x_2,y_2,z_2)` are two vertices and `(alpha, beta, gamma)` is the centroid of a triangle, find the third vertex of the triangle.

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A, B, C
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