If $P(2, 2)$,$Q(-2, 4)$,and $R(3, 4)$ are the vertices of $\triangle PQR$,then the equation of the median through vertex $R$ is $........$
- A$x+3y-9=0$
- B$x-3y+9=0$
- C$x-3y-9=0$
- D$x+3y+9=0$
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