Let the area of a $\Delta PQR$ with vertices $P(5,4),Q( - 2,4)$ and $R(a,b)$ be 35 square units. If its orthocenter and centroid are $O\left( {2,\frac{{14}}{5}} \right)$ and $C(c,d)$ respectively, then $c + 2d$ is equal to
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