Consider the solid E that occupies the tetrahedral region formed by the coordinate planes, x = 0, y = 0 and z = 0 and the plane (x/a) + (y/b) + (z/c) = 1  for some positive constants a, b, and c.  Assume the mass density is ρ(x, y, z) = 1.  Find the x-coordinate, of center of mass of the solid.

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