Equation of triangle and solution of Bisector?

Geometry Level 4

A \(\triangle\) \(PQR\) has vertices \(P =(-8,5), Q =(-15,-19)\), and \(R =(1,-7)\) . The equation of the bisector of \(\angle P\) can be written in the form \(ax+2y+c=0\) . Find \(a+c\)..

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