Find the coordinates of the center of mass of the following solid with variable density.\\
R = \{(x,y,z): 0 \le x \le 8, 0 \le y \le 1, 0 \le z \le 5\}; \rho(x,y,z) = 2 + \frac{x}{3}\\
The center of mass is located at (\boxed{\qquad}, \boxed{\qquad}, \boxed{\qquad}).\
(Type exact answers.)